Samsung SCH-3500 - Manual (Page 99)

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Maintaining your phone’s peak performance.
To operate your phone properly — that is, to maintain safe
and satisfactory service — you should follow these rules:
For best reception, extend the antenna fully.
Hold the phone with the antenna up and over your
shoulder.
Do not hold, bend, or twist the phone antenna at any
time.
Close the phone antenna when not on a call.
Do not use the phone with a damaged antenna.
Speak directly into the microphone.
Avoid exposing your phone and accessories to rain or
liquid spills. If your phone gets wet, turn the power off
immediately, remove the battery, and allow the phone
an battery to air dry for 10 hours (in normal room
temperature and humidity). If after the 10 hour drying
time, the phone is inoperable, you should return it to
the store where you purchased it, or a Sprint PCS
authorized service center.
Only Sprint PCS authorized personnel should service your
phone and its accessories. Faulty service may invalidate the
warranty.