Zte F350 - 16. Troubleshooting; Fail to power on the phone; The phone has powered off automatically

F350 User Manual
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16. Troubleshooting
Fail to power on the phone
Check whether the battery has adequate capacity to power on.
The phone has powered off automatically
The battery capacity is quite low, please charge the battery.
No key tone when pressing the keys
Check whether the keypad tone has been disabled. You can set key tone settings via
Menu
→Settings & Tools→Sounds Settings→Keypad Volume.
No incoming ringtone when receiving a call
Check whether the phone is set to Silent Mode or the phone volume is turned off by
the Volume key.
Can not send a message
Check the status of the network.
Can not answer an incoming call by the headset automatically
Check whether Auto Answer function is on in the call setup settings, via Menu
→Settings
& Tools
→Call Settings→Answer Options.