Go to Settings > Network & internet/Connection & sharing > Airplane Mode and tap the switch to toggle it on and off again. You can also swipe down from the top of your screen and tap the airplane icon.
To restart your phone, press and hold the Volume Down and Power button for about 10-20 seconds or until your phone shuts down (the screen will be black). Let go of those buttons, and you should see the Android logo as your phone restarts.
To remove your SIM card, turn off your phone, then use a small, pointy tool, like an unbent paperclip, to eject your SIM tray. After the tray is ejected, gently remove your SIM card, and clean it (wipe down the metallic surface with a disinfectant wipe or a cotton swab dipped in rubbing alcohol). Reinsert it and turn your phone back on. [2] X Research source If your SIM looks really dirty or grimy, you may need to replace it.
Updating is easy! Simply go to Settings > Software Update/About Phone > Download and Install. You phone will restart to apply the update. To make sure that you get the update, connect to Wi-Fi instead of using mobile data, which gives you the error.
To turn Data roaming off, go to Settings > Network & internet/Connections > Mobile Networks > Roaming and tap the switch to toggle it off.
To reset your network settings, go to Settings > System/General management > Reset > Reset WiFi, mobile & Bluetooth/Reset network settings > Reset settings. Your phone will restart with network settings reset to default. Try connecting to the internet again or making a phone call to see if you get the “Mobile network not available” error.
To switch mobile network operators, go to Settings > Connections > Mobile networks > Network operators > Automatic or Manual. If you’re already on Automatic, pick Manual. If you’re currently on Manual, pick Automatic.
To change network types, dial ##4636## and a new menu will appear. Tap Phone information > Run Ping Test and after you get that information, tap Set preferred network type and select either GSM, LTE, or LTE/UMTS options. If you still get the error, you can change which network type you’re using. If none of them work for you, change it back to the default.
You should first make a backup of your current Android’s settings and files. To create a back up, go to Settings > Accounts & Backup > Back up Data > Back up now. To reset, go to Settings > General management > Reset > Factory data reset > Reset. Enter your PIN if prompted.
