Huawei Ascend G630-U251 User Guide - Manual (Page 15)

Getting started
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If the battery power is depleted, you may not be able to power on your
phone immediately after you begin charging the battery. This is normal.
Allow the battery to charge for a few minutes before attempting to power
on your phone.
Powering on or off your phone
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To power on your phone, press and hold the power button.
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To power off your phone, press and hold the power button to display an
option menu, and then touch Power off > OK .
If you are experiencing slowdown issues or the system doesn't respond
or can't be properly powered off, press and hold the power button for
10 seconds or more to restart your phone.
Locking and unlocking the screen
Locking the screen not only prevents mistaken operations from occurring
without your knowledge, but also protects your phone from unauthorized
use. You can lock and unlock your screen in a number of different ways and
also add lock screen widgets. The pre-installed screen unlock method is used
as an example in this section.
Locking the screen
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Method 1: Press the power button to manually lock the screen.
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Method 2: After being idle for a specified period of time, your phone
automatically locks its screen.
To set the screen lock method, touch on the home screen. On the
displayed General tab, touch Screen lock .