Samsung SWC-R640LBAXAR - Manual (Page 20)

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Note: If you are outside of your carrier’s coverage or roaming area, the No Service
icon ( ) displays at the top of the phone’s screen. If you cannot place or
receive calls, try later when service is available, or at another location.
Turn Your Phone Off
ᮣ Press and hold the End key ( ), on the bottom right of the
phone, for two or more seconds. Your phone powers off.
Note: If your phone is on and you press for less than one second, the phone
does not power off. This prevents your phone from accidentally being
turned off.