User manual

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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,

Press and hold the Power Button and volume-up button at the same
time for more than 10 seconds.
To turn off the phone, Press and hold the Power Button for more than 3
seconds, and then drag the white-colored button downwards.