Frequently Asked Question
Call & Contacts
1. Download the music to your phone.
2. For some models ,you can just keep pressing the music for seconds,and the secondary menu will pop up automatically ,you can choose “set it as ringtone” .
3. For other models, you need find the “Ringtone” folder in your document management (file manager) , put your music in the “Ringtone” folder first , then you can go to setting>sounds to set it as your ringtone.
1. IF or not all the contacts cannot be called. if yes, go to step 2. If not, maybe not phone issue.
2. Make sure SIM account has enough balance and the place have good signal.
3. Check whether phone is on 4G only mode, if yes, change to other modes.
4. Try to reset factory settings, but remember to take data back up first.
5. Visit the nearest customer service center for further check.
1. Make sure the new contacts are added in the correct way.
2. Try to reboot the phone or reset factory settings, but remember to take data back up first.
3. If problem remains, visit local customer service center for further check.
1. Copy the contacts from the old phone to the SIM card>Insert the SIM card to the new phone>Copy the contacts from SIM card to the new phone.
2. Go into Settings>back up, back up the contacts to the SD card>Copy the contacts to the new phone from the SD card.
3. Back up the contacts with GoogleContactsSyncAdapter.apk.
1. If the contacts were backed up by phone or any third party apps(like Easy back up & reset app） before, it can be reset directly. Otherwise, they cannot be reset
1. Set the contacts shown both the SIM card and the phone.
2. Check third party apps, make sure contacts in those apps are different from those in your phonebook, that they have different numbers and names,otherwise there will be conflicts.
3. Visit the nearest customer service center for further check.
1. Reboot the phone and check whether have recent calls.
2. Reset factory settings, but remember to back up the important files.
3. If the problem remains, visit local customer service center for further check.
1. Check whether SIM signal is in good condition, try other places with better network.
2. Make sure SIM account has enough balance, call local communication operator to verify if they have some policy to your account.
3. Change another SIM card or reassemble the SIM card and then check .
4. If not ok, try to reset factory settings, but remember to back up the important files.
5. Visit local customer service center for further check.
1. Make sure the phone is under good network signal, try other places with better network.
2. Make sure the SIM has enough balance.
3. Maybe false touch the screen of hang up related.
4. Reboot the phone or reset to factory settings, but remember to back up the important files.
5. Visit the nearest customer service center for further check
1. Make sure phone is under good network signal, try other places with better network.
2. Make sure the SIM account has enough balance.
3. Check whether you’ve set a blacklist.
4. Update phone system to the latest version.
5. Visit local customer service center for further check.
1. Reset factory settings, but remember to back up the important files.
2. Update phone system to the latest version when phone has access to high speed network.
3. If problem remains, visit local customer service center for further check.
1. Cancel the Airplane mode, try to save contacts again.
2. Update phone system to the latest version when phone has access to high speed network.
3. If still can’t save, try to reset factory settings, but remember to back up the important files.
4. If factory reset doesn’t work, try to visit the nearest customer service center for further check.
1. Check whether the network signal is in good condition, try other places with better network.
2. If problem remains, try to visit the nearest customer service center for further check.
1. Make sure the phone is not on vibrate or silent mode.
2. Check whether the volume has been turned on in general mode.
3. Make sure speaker is still in good condition.
4. Try to reset factory settings, but remember to back up important files.
5. If problem remains, try to visit the nearest customer service center for further check.
1. If you want to intercept some call or phone number, you have to download a third party app to intercept ,such as Call Blacklist or Call Blocker.
1. Try to release phone space by deleting unnecessary apps or files.
2. Move all contacts from SIM card to phone.
3. Try to update phone system to the latest version.
4. If problem remains, try to visit the nearest customer service center for further check.
1. That may because of no signal ,try other places with better signal.
2. SIM card loose, clean and reassemble the SIM card.
3. Check whether phone has been bound up with specified service provider, try other SIM cards.
4. If problem remains, try to visit local customer service center for further check.
1. If you enable Blacklist feature on a particular number, you will not receive calls from that number.
1. Check whether SIM card signal is good, try other places with better network.
2. Make sure you have sufficient balance.
3. Visit the nearest customer service center for further check
1. Make sure your security system has given Whatsapp the access to your contacts.
2. Make sure the person you want to Whatsapp is using Whatsapp too.
1. Open the contact, block the number.
2. Need to download a third-party software, such as Calls Blacklist.
1. Make sure the phone is not in silent mode.
2. Pull down the notification bar and change the sound.
3. Try to reset factory settings, but remember to back up the important files.
4. If problem remains, try to visit local customer service center for further check
1. Try to update phone system to the latest version first.
2. Try to reset factory settings, but remember to back up the important files.
3. Try to visit local customer service center for further check.
Please check the possible reason and troubleshooting steps below to solve your issue:
1. The phone is in Airplane mode, please turn off Airplane mode.
2. Call barring is set for the phone, please cancel the call barring for the phone.
3. The PIN code of SIM card is locked, please use the PUK code of SIM card to unlock the PIN code (the PUK code can be obtained by providing the carrier with the SIM card service code).
4. SIM card loose, clean and reassemble the SIM card or try another SIM card with sufficient balance.
5. The phone serial number (IMEI number. is lost, On dial screen, enter “#06#” to view the phone serial number (IMEI number), If the serial number is lost, bring the phone to a local service center.
6. The surrounding environment interferences, weak signal, or signal blind spots, try other place with better signal.
7. Phone firmware is faulty, please bring the phone to a service center to fix the software, or download the corresponding firmware from official website and update the phone with it.
1. This feature is available only on some models:Settings>Call Settings>Advanced Settings>Auto Call Recording>Off/On
1. Go to “Setting” and set the default SIM card.
Sometimes the network goes wrong because of the frequent usage, you can:
1. Wait for while and check again.
2. If the memory of the phone is full, the phone may keep receiving message. Delete some trashy message to see if ok or not.
3. Consult your service provider to see whether it is the problem of your network.
4. Visit local customer service center for further check.
1. Check whether SIM card signal is normal and good, and whether data is turned on.
2. Make sure SIM account has enough balance.
3. Check whether phone has activated MMS.
4. Check whether phone number is correct.
5. Visit local customer service center for further check.
1. Make sure SIM signal is normal and good.
2. Make sure inbox still has enough space.
3. Check whether terminal configuration runs well.
3. Visit the nearest customer service center for further check.
1. Make sure SIM signal is normal and good.
2. Make sure SIM account has enough balance.
3. Make sure receiver’s phone number is correct.
4. Reboot the phone or reset factory settings, but remember to take data back up first.
5. If problem remains, try to visit the nearest customer service center for further check.
1. Check your internal storage, try to delete unnecessary files and apps.
2. Try to download some third-party app to release your internal memory, such as CCleaner or Clean Master.
3. Try to reset factory settings, but remember to take data back up
1. Open mail app, enter your account and password correctly, then the phone will setup automatically.
1. Make sure phone has access to valid network first.
2. Make sure e-mail account and password are valid.
3. Try to reset factory settings, but remember to back up important files first.
4. Try to visit local customer service center for further check.
1. Make sure phone’s covered by high speed network first.
2. Delete the e-mail account and log in again.
1. Reset factory settings, but remember to back up the important files.
2. if it doesn’t work, then try to visit local customer service center for further check.
1. Make sure phone has LED notification function for unread messages and missed calls, most of phones have cancelled this function.
2. If it does, but not functioning, you can then try to reboot your phone, reset factory settings, but remember to take data back up first.
3. If it doesn’t work, then you can try to visit local customer service center for further check.
Camera & Picture
1. Reboot the phone or download some third part camera related App.
2. Try to reset factory settings, but remember to back up the important files.
3. Update phone system to the latest version.
4. Try to visit local customer service center for further check.
1. Make sure you set the focus correctly.
2. Check camera lens to see whether it’s dirty, clean it.
3. Check the inside of camera to see whether there is vapor. Visit the nearest customer service center to clean it. Take important data back up before you go.
4. Check the software in customer service center.
1. Back up important data and restore your phone to factory settings, or update the system to the latest version.
2. Visit local customer service center for help directly.
1. Maybe the auto-focusing delay the process, you can try a manual focusing.
2. Back up important data and reset your phone to factory mode, or update the system to the latest version.
3. Visit local customer service center for help directly.
1. Make sure you’ve on flashlight when taking pictures.
2. Make sure flashlight is not occupied by other apps, try to clear cache or reboot the phone.
3. Try to reset factory settings, but remember to back up important files.
4. If still not work, then try to visit local customer service center for further check.
1. Check whether you have opened any apps that use the camera (such as third-party flashlight or scanning apps.. If so, close these apps and try again. Alternatively, restart your phone.
2. Back up important data and reset your phone to factory mode, or update the system to the latest version.
3.If the issue persists, take your phone to your nearest customer service center for inspection.
1. Guiding users download and install the “Mito with Xiu Xiu”third party app in play store,the app has the function of the corrective camera.
Charging
1. Try to visit local customer service center for further check.
1. Make sure your phone is fully charged. When your phone is completely out of power, you may not be able to power on your phone when you first plug in the charger. Please wait for several minutes.
2. Press and hold the power button for more than 10 seconds to forcibly restart your phone.
3. Back up important data and restore the factory settings or update your phone to the latest version.
NOTE:
1. Before updating, please make sure your phone is fully charged otherwise the update may fail.
2. Due to the fact that your phone will not power on, a forcible update may result in the loss of your data. Please make sure your phone has no important data on it or that you have already backed up your data in advance.
3. If the problem persists, please take the receipt issued with your phone to customer service center for repair.
1. Make sure you’re using the original charger, try other original charger to see whether problem comes from your charger.
2. Check your charging port to see whether it’s get stuck by dirt or other foreign objectives.
3. If nothing’s wrong with the charging or the port, then try to visit local customer service center for further check.
1. Make sure you’re using the original charger, try other original charger to see whether problem comes from your charger.
2. Check your charging port to see whether it’s get stuck by dirt or other foreign objectives.
3. System runs slowly because of too much system cache after using Android Phone for a long time, suggest to reset factory or software upgrade.
4. Charging slowly with battery, suggest change new battery.
5. If nothing’s wrong with the charging or the port, then try to visit local customer service center for further check.
1. Check the voltage/current of charger you use,make sure them match the specifications with the requirements of the phone.
2. Visit local customer service center for further check.
1. The charger contains components that may vibrate slightly during use. This is normal and does not indicate that the charger is faulty.
2. Unplug the charger after use.
3. The charger has passed stringent safety tests and is safe to use.
1. Make sure you are using the original charger or data cable to charge your phone.
2. If the charging lamp does not light, it maybe due to the charger issue or the connection with the charger. If the LED light but the power is not increased, maybe the phone issue.
3. Check that there is a good connection for your data cable, charger, charging port, and power socket. Unplug the cable and plug it in again.
4.Check whether your data cable, charger, charging port, and power socket are damaged. If they are damaged, replace them.
5.Check that your phone isn’t too hot. Our phones have a heat protection mechanism where they stop charging when the temperature is too high. It is not recommended to use your phone while it is charging, especially for games, videos, surfing online, or other applications which use too much power.
6.If your battery is empty, use the original charger to charge your phone for 5 minutes, and then check to see if it charges normally.
7.If you are using a mobile power supply, check whether the output current is the same as the original charger. If it is different, this may cause abnormal charging.
8.If the problem persists, back up your data and take your phone with its receipt to customer service center for repair.
1. Check whether the surface of your charger has been damaged. If it is damaged there may be an electric leakage. Stop using the charger immediately and replace it with an original charger.
2. Check that you are using an original charger.The original chargers have been through rigorous verification tests and comply with the Chinese CCC and international IEC60950 safety standards. For normal use, it is not possible to get an electric shock from these chargers. Safety cannot be guaranteed if you buy non-standard accessories from unauthorized channels which haven’t been strictly designed and checked, haven’t been through verification tests, and do not have safety certifications.
3. Ensure that you have connected to a normal home power grid.Check whether this occurs for other appliances around the house
4. If the problem persists, back up your data and take your phone with its receipt to customer service center for repair.
1. Restart your phone.
2. Back up any important data on your phone and restore the factory settings.
3. If the problem persists, back up your data and take your phone with its receipt to customer service center for repair.
1. If the phone is charged using a non-original charger, the software will identify it as non-standard charger and restrict the charging current so that the phone cannot be charged to full capacity.
2. Moreover, if the charging temperature exceeds the normal range (0-45℃., the software will also restrict the charging input so that the phone cannot be charged fully.
3. Phone charging environment: Keep the phone far away from heat sources, and avoid direct sunlight.
1. Close all unnecessary application running in background.
2. Remove unused application from phone. Always update application with latest version.
3. Make sure the contact between phone and battery is in good condition.
4. Uninstall application after which phone started giving such symptom.
5. Try to reset factory settings, but remember to back up important files.
6. Visit local customer service center for further check.
Internet & Network
Pls try to install a Wechat app from play store, www.wechat.com/mobile/htdocs/en/android.html
on your phone.
Pls install a wechat www.wechat.com/zh_TW/
on your computer,
login your id both on phone and computer,can transfer files without USB cable,just need internet data.
You can choose the files on your phone ,send to your computer,like send a message.
1. Use the USB cable to connect your phone to your computer.
2. Go to phone Settings>Wireless&Network>More>Tethering & Portable Hotspot>Select USB tethering.(There may be subtle variations in different versions /models.)
3. After driver is installed, your phone will be connected to the Internet automatically.
1. Use the USB cable to connect your phone to your computer.
2. The notification bar will shows some options that you can choose to charge phone only, or use your phone as storage.
1. Download and install 360 mobile phone assistant or other android assistants.
2. In 360 mobile phone assistant, open the file management page, find and select the files that need to upload, choose the menu of “sent to the computer”, and transmitted them to the computer folder.
1. Try to re-insert the earphone several times.
2. Try to reset factory settings, but remember to back up the important files.
3. Try to visit local customer service center for further check.
1. Try to re-insert the earphone several times or try another earphone.
2. Check the hole of the earphone,whether it has been corroded or damaged.
3. Try to reset factory settings, but remember to back up the important files.
4. Try to visit local customer service center for further check.
1. Using earphones while the phone is charging may cause noises due to current interference, please try to avoid using earphones while the phone is charging.
2. The earphone sound hole is blocked or polluted, please clean the earphones and make sure the earphone sound hole is open.
3. The earphone does not match this phone, please use the original earphones or those earphones that comply with the phone socket standards.
4. Phone firmware is faulty, please download the latest firmware from the official website and update the phone.
5. Earphones are damaged or faulty, please try another pair of earphones to check if the fault remains. If not, that means the fault is caused by the earphones themselves, so replace them with some workable earphones.
Please check what the computer and the phone feedback, then choose possible reason and troubleshooting steps below to solve your issue:
1. USB devices are forbidden on the computer, please allow USB devices in computer Device Manager.
2. The computer or the phone no response, and the charge lamp not bright: USB data cable is broken, please check other USB port.
3. Phone firmware is faulty, please bring the phone to service center to fix the software, or download the corresponding firmware from official website and update the phone with it.
1. Activate Location in notification bar.
1. Make sure GPS is on.
2. If phone’s indoor, try it outdoor.
3. Try other places with better network, reboot the phone to try again.
4. Try to reset factory settings, but remember to back up important files first.
5. Try to visit the nearest customer service center for further check.
1. Download offline map when you in Wi-Fi condition.
1. Go to Settings > schedule power off and on to see whether you’ve on it. If so, cancel it.
2. Make sure the contact between phone and battery is in good condition.
3. Uninstall application after which phone starts appearing such a symptom.
4. Try to reset factory settings, but remember to back up important files.
5. Visit local customer service center for further check.
1. Try to delete unnecessary files/ apps and clear cache regularly.
2. Avoid heavy games, videos and constantly long time use.
3. Try to reset factory settings, but remember to back up important files first.
4. Update the phone to the latest system version in Settings > About phone > System update.
1. Reboot the phone or reset factory settings, but remember to back up the important files.
2. If problem remains, try to visit local customer service center for further check.
1. Fully charge the battery according to the instructions listed in the user guide.
2. Remove and re-insert the battery according to the instructions listed in the user guide (For phones with removable battery).
3. Check that if you are using an original battery and charger is compatible with your phone model (You can find compatibility information in your user guide).
4. If you have access to another battery and charger of the same type as yours, try to substitute them to determine if the issue is on the phone, the battery, or the charger.
5. Make sure your device is running the latest software, please update it if not.
1. The phone is power off automatically due to low battery. please charge the phone when you see the low battery reminder.
2. Bad contact of phone battery, please reload the battery and make sure that the battery has good contact with the phone.
3. The automatic power-on/off function is turned on via phone settings, please uninstall or update the corresponding applications.
4. There are too many running applications, which causes reboot due to low memory, please terminate unused applications to ensure sufficient memory for phone operation.
5. The phone is under high load for a long time, which causes power-off due to overheat self-protection, please make sure the phone is running under allowed temperature range.
6. Loose SIM card or bad contact between SIM card and phone, please re-install the SIM card and ensure good contact with the phone.
Mobile phone shutdown or frequent restart automatically, is usually caused by the data conflict or system problem.
Can follow the steps below to troubleshoot:
1. If you run a APP, it may be caused by the APP itself and you can reinstall the app to see if it turns normal.
2. Some third-party security softwares with antivirus can easily lead to data conflict, uninstall these software and then restart the mobile phone to check if it is OK.
3. The above ways are invalid, suggest you to customer service center detection.
1. Make sure SIM account has enough balance or there is a valid Wi-Fi.
2. Open the mobile data or WiFi.
3. Try to connect a usable WiFi with correct password.
1. Go to other places with better network signal.
2. Change another Operator’s SIM card and test.
3. Reboot the phone or reset factory settings, but remember to back up the important files.
4. If still no signal, try to visit local customer service center for further check.
1. Make sure both phone and SIM card support 3G, and phone is covered by 3G network first.
2. Set the network type to 3G mode.
3. If still can’t use 2G, try to visit the nearest customer service center for further check.
1. Enquire the phone store or refer to product specification.
2. Disable the mobile data or change the network type to GSM.
1. Yes. If you do not use the data, close the mobile data, and try to use the WiFi.
1. Pull down the notification bar and close the mobile data.
1. Make sure SIM account has enough balance and the phone support brower function.
2. Make sure phone is on valid data or WiFi, and website address is correct.
3. If problem remains, try to visit local customer service center for further check.
If can’t connect to WiFi, please:
1. Make sure the router works normally, try to reboot or reset the router.
2. Make sure phone is close enough to the router in order to be covered by WiFi signal.
3. Check whether you’ve entered the correct password.
If can’t connect to mobile data, please:
1. Make sure SIM card work normally, SIM signal is in good condition.
2. Make sure SIM card has enough balance.
If still can’t connect, you can then try to reset factory settings, but remember to take data back up first. If factory reset doesn’t work either, please try to visit local customer service center for further check.
1. Make sure both phone and SIM card support 3G.
2. Make sure phone is currently covered by 3G network, or try other places with better network.
3. Consult your service provider about it.
4. Try to visit local customer service center for further check.
1. Make sure WiFi signal is strong and valid, and you entered the correct password.
2. Try to reboot or reset the WiFi router, and connect again.
3. Try to reboot your phone and connect again.
4. Try to reset factory settings, but remember to back up important files.
5. Try to visit local customer service center for further check.
1. Make sure phone has connected to strong and valid network.
2. Make sure phone has enough space for downloaded files.
3. Make sure you download from reliable sources.
4. If still can’t download, try to visit local customer service center for further check.
1. Make sure SIM card signal is normal and strong.
2. Make sure you chose correct APN.
3. Check whether website address is correct.
4. Consult your service provider or visit local customer service center for further check.
1. Make sure it’s not the problem of the poor net signal first.
2. Try to reset factory settings again, but remember to take data back up first.
3. If it doesn’t work, then visit local customer service center for further check.
1. Try to reset factory settings, but remember to back up the important files.
2. If it doesn’t work, visit local customer service center for further check.
1. Network signal may be weak at your current location, try other places with better network.
2. Check with your service provider about it.
3. If nothing’s wrong with the signal, then try to visit local customer service center for further check.
1. Make sure the hotspot signal is valid and strong.
2. Make sure your phone is close enough to the hotspot signal.
3. Make sure you entered correct password.
4. Try to disconnect and then connect again.
1. Make sure the phone has Tethering&portable hotspot first, go to Settings > Tethering&portable hotspot > WiFi hotspot > set up WiFi hotspot > set password.
2. There may be subtle variations in different versions /models.
1. You can set the current network usage status under “Settings > Mobile network”.
2. Data: When the cellular data connection is activated, you can use network-related applications such as Browser and Email via a data network. carrier. Carrier for details.
3. Network:SIM1/SIM2: You can modify the settings of SIM1/SIM2 in “Mobile network” interface after you put to SIM cards in the phone. After startup of the device, both cards can stand by.
4. Network mode: You can choose different network mode based on the type of SIM card.
Note:
1. When you come across network anomalies under 4G(preferred)/3G/2G mode, please try to set as 3G(preferred)/2G.
2. Data roaming: With this feature enabled, you can connect to data service when in international roaming. Please be aware that enabling data roaming may cause considerable roaming charges.
Carriers:
1. When you are out of range of your SIM card carriers, you can only make calls via local carriers that have roaming agreements with your SIM card carriers. You can set available carriers here. You may need to pay extra fees for the mobile services provided by these carriers.
APN:
1.You can set APN based on the type of you SIM card. Usually these features does not need your setting, as they are defaulted before delivery. If your SIM card has enough money loaded, then you can use these features out of box. you can connect to the Internet soon as you enabled the “Mobile network” feature. If you by accident have the features incorrectly set or the APN removed, all you need is simple tap “Reset to default”. Cellular data networks may vary depending on the type of SIM card. Please choose the proper APN based on the local traffic plan. Please consult the network operator for details.
Edit name:
Tap “Edit name” to edit the name of SIM card.
1. You can enable or disable Wi-Fi under “Settings > Wi-Fi”. Choose a network connection after enabling Wi-Fi.
2. If a Wi-Fi network is encrypted then is displayed and you need to enter the password.
3. When your phone is connected to a Wi-Fi network, the signal strength of the Wi-Fi network will be displayed in the status bar at the top of the screen. The more bars you see, the stronger the signal.
4. If there is no Wi-Fi network available, or you have disabled Wi-Fi, your phone will try to connect to the Internet via a cellular data network.
5. Once your phone is connected to a Wi-Fi network, it will connect to the network automatically when in range. If more than one previously used Wi-Fi network is in range, your phone will connect to the most recently used network.
1. If you want to add a Wi-Fi network that is not in the list of available networks, please choose “Add network” and enter network SSID. You need to know the network name, password and security type before connecting to it.
2. For advanced settings on a Wi-Fi network, you can press the [Menu button] and tap “Advanced settings”.
Please check the possible reason and troubleshooting steps below to solve your issue:
1. Wi-Fi signal is too weak to establish the connection, please make sure the Wi-Fi signal is good enough when trying to connect.
2. Connection restrictions have been set on wireless router (such as MAC/IP filtering), please change the connection restriction of the router.
3. Phone firmware is faulty, please download the firmware from official website and update the phone.
1. Make sure your phone supports the 4G network.
2. If your phone is a customized version, you can only access the 4G network using the SIM card issued by the corresponding carrier.
3. Make sure the SIM card is a 4G card.
4. Use a standard SIM card provided by your carrier. Hand-cut or non-standard SIM cards may cause your phone to malfunction. After you have replaced your SIM card with a new one, call your carrier to update your background data, and then restart your phone.
5. You have activated the 4G data plan and the enabled the 4G network connection on your phone.
6. Make sure the carrier provides local 4G network coverage.
Personal Hotspot
1. Wi-Fi Hotspot: You can share the phone’s internet connection by creating a Wi-Fi hotspot.
2. Configure Wi-Fi hotspot: You can manually change the default network, security and password settings (You are recommended to keep the default settings. Tap “Show password” to view the password.
3. Share phone network via Bluetooth: You can share the phone is Internet connection via Bluetooth. Mobile network tethering will incur data charges. Wi-Fi tethering is recommended.
4. Share phone network via USB: You can share your phone’s network with USB that is connected to your computer.
5. Change Wi-Fi hotspot password:
You can tap “Password” under “Settings > Personal Hotspot > Configure Wi-Fi hotspot”, enter a new password, then tap “Done” (Initial password is considered as default password).
6. VPN settings:
An organization’s internal VPN allows you to communicate private information securely over a public network. For example, you may need to configure a VPN to access your work emails. You can tap “Settings > More settings > VPN settings” to configure the VPN. You have to set a screen lock pattern or password before setting up this function. As for details on how to set an lock pattern or password, please go to Security in “Settings”.
Please follow the troubleshooting steps below to solve your issue:
1. Make sure your phone is supported LTE.
2. Make sure the mobile data is already enabled: please go to settings > Mobile networks > Enable data.
3. Update your system to the latest version: please go to settings > About phone > System updates.
4. Contact the local operator and check the coverage of LTE network.