Instructions

If the proportion of battery is too low, it is likely that you won't be able to turn on you
phone. You should charge the battery to continue using your phone.
Restart or Turn Off Your Phone
If something isn't working right, try to restart your phone.
To restart the phone, you can:
 Press and hold the Sleep/Wake button for more than 3 seconds, and then drag
the white-colored power icon up to restart or,