Zte smart first 7, Руководство пользователя

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NOTE:
If the battery is seriously depleted, you may be unable to power
on the phone even when it is being charged. In this case, try
again after charging the phone for at least 20 minutes. Contact
customer service if you still cannot power on the phone after
prolonged charging.
1.6 Extending the battery life
Active applications, screen brightness levels, Bluetooth, Wi-Fi,
and GPS functionality can drain your battery. You can follow the
tips below to conserve your battery power:
 Enable the Battery saver. See Battery for details.

Reduce the screen backlight time.

Lower the screen brightness.

Turn auto-sync, Wi-Fi, and Bluetooth off when not in use.
 Disable the GPS function when not in use. Most
applications using this function will periodically check the
GPS satellites for your current location; each check drains
your battery.
1.7 Powering on/off

Press and hold the
Power
key to turn on your phone.

To power off, press and hold the Power key to open the
options menu. Touch
Shut down
.
NOTE :
If the phone freezes or takes too long to respond, you can press
and hold the Power key for about 16 seconds to power the
phone off, and then turn it on again.