Huawei Ascend G620S Quick Start - Manual (Page 4)

Locking and unlocking the screen
Press the power button to lock the screen.
Your phone automatically locks its screen after being idle for
a specified period of time. You can touch > Display >
Sleep to set the screen timeout period.
If the screen is off, press the power button to turn it on. Slide
your finger toward any direction to unlock the screen.