To Wake Up The Phone - Google Nexus One User Manual

Android basics

To wake up the phone

If you don't use the phone for a while, the Home screen or other screen you are
viewing, is replaced with the lock screen and then the screen darkens, to conserve the
battery.
1 Press the Power button.
If you've locked your screen with a pattern, you must draw the unlock pattern to
unlock it. See "Locking your screen" on page 57.
If you haven't locked your screen with a pattern, the lock screen appears.
2 Drag the lock icon to the right.
The last screen you were working on opens.
To return to the Home screen
Press the Home
S
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button at any time, in any application.
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Nexus One User's Guide