14
Developer options.
Sound
In this menu you can set Volumes, Call ringtone & vibrate and set the system sound.
Display
In this menu you can set the wallpaper in your phone and set the display such as
brightness level, sleep time, daydream etc.
5. Frequently Asked Questions and Troubleshooting
Questions
Cause and Solution
Unable to
turn on
phone
Press the power on key for over 1 second.
Check if battery is appropriately charged
Unable to
connect to
network
Weak signal. Please Try and move to a location with strong
signal and try connecting to the network again
；
Please ensure that you are not beyond the network coverage
of service providers
；
Please ensure you have a valid SIM card. Please contact your
network provider for further information
Display
information
while
turning on
Check if the SIM card (insert the SIM card) is installed
correctly
Handset lock password: If the handset lock is activated, you
have to input handset password before using.
Input PIN: Inputting PIN while turning on each time is
activated, you have to input the PIN code.
Input PUK code: Having input wrong PIN code for 3 times
straight will lock the SIM card. You need to input the PUK
code provided by your network provider.
Poor quality
of calling
Please check if the sound volume is tuned improperly
In an area with poor receiving condition, example: basement,
the signal might be weak. Try reaching a location with
stronger signal reception and call again.
While using the mobile phone in the peak period of
communication, like commute time, you may be unable to
call because of line congestion.
