Samsung SOUL SGH-U900 - Manual (Page 30)

using basic functions
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Turn your phone on and off
To turn your phone on,
Slide open the phone. 1.
Press and hold [ 2. ].
Enter your PIN and press < 3. Confirm > (if necessary).
To turn your phone off, repeat steps 1 and 2 above.
Switch to the Offline profile
By switching to the Offline profile, you can use your
phone’s non-network services in areas where wireless
devices are prohibited, such as aeroplanes and hospitals.
To switch to the Offline profile, press < Menu > → Settings
→ Phone profiles → Offline .
Follow all posted warnings and directions from official
personnel when in areas where wireless devices are
prohibited.