Samsung OG-I9020FSTTMB - Manual (Page 14)

Your phone and accessories 14
NSOG-1.0-104 Nexus S Owner’s Guide
Turn off the phone
1 Press & hold the Power button until a menu opens.
2 Touch
Power off in the menu.
3 Touch OK when asked to confirm that you want to turn off the phone.
For more about working with the touchscreen and menus, see the Android User’s
Guide.