Samsung A640, Instruction Manual, Page: 248 / 265

226 Section 4A: Important Safety Information
General Precautions
There are several simple guidelines to operating your phone properly and
Speak directly into the mouthpiece.
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Avoid exposing your phone and accessories to rain or liquid spills. If
your phone does get wet, immediately turn the power off and remove
the battery.
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Although your phone is quite sturdy, it is a complex piece of
equipment and can be broken. Avoid dropping, hitting, bending, or
sitting on it.
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Any changes or modifications to your phone not expressly approved in
this document could void your warranty for this equipment and void
your authority to operate this equipment.
Note: For the best care of your phone, only Sprint-authorized
personnel should service your phone and accessories. Failure
to do so may be dangerous and void your warranty.