Use The Touchscreen - Samsung GALAXY CORE Prime User Manual

2. Tap Power off to turn the phone off.
Your phone will power off.
Your screen remains blank while your phone is off (unless the battery is charging).

Use the Touchscreen

Your phone's touchscreen lets you control actions through a variety of touch gestures.
Tap or Touch
When you want to type using the onscreen keyboard, select items onscreen such as application and
settings icons, or press onscreen buttons, simply tap or touch them with your finger.
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