HTC magic Mode D'Emploi

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Managing your Phone  187
Protect your phone with a screen lock
You can further secure your data by locking the screen and/or requiring a screen 
unlock pattern every time your phone is turned on or every time it wakes up from 
sleep mode (screen is off).
To lock the screen
Press the END CALL/POWER button. Locking the screen prevents accidental screen 
touches when the phone is in your bag, purse, or pocket.
Note 
To unlock the screen, press one of the buttons in front of the phone, and then press 
MENU.
To create and enable the screen unlock pattern
You can increase the security of your phone by creating a screen unlock pattern. 
When enabled, you have to draw the correct unlock pattern on the screen to unlock 
the phone’s control buttons and touch screen.
1. 
Press HOME > MENU, then touch Settings.
2. 
Touch Security > Set unlock pattern.
3. 
Read the information on the screen, then touch Next.
4. 
Study the example pattern on the screen, then touch Next.