Samsung SCH a670 User Manual

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Switch your phone off before boarding an aircraft. The use of 

wireless phone in aircraft is illegal and may be dangerous to 
the aircraft's operation.

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Failure to observe these instructions may lead to the 

suspension or denial of telephone services to the offender, or 
legal action, or both.

The quality of each call you make or receive depends 
on the signal strength in your area. Your phone informs 
you of the current signal strength by displaying a 
number of bars next to the signal strength icon. The 
more bars displayed, the stronger the signal.

If you're inside a building, being near a window may 
give you better reception.

If your phone is unable to find a signal after 15 minutes 
of searching, a Power Save feature is automatically 
activated. If your phone is active, it periodically 
rechecks service availability or you can check it yourself 
by pressing any key.

Anytime the Power Save feature is activated, a message 
displays on the screen. When a signal is found, your 
phone returns to standby mode.

Your phone is basically a radio transmitter and receiver. 
When it's turned on, it receives and transmits radio 
frequency (RF) signals. When you use your phone, the 
system handling your call controls the power level.