Samsung SWC-R640LBAXAR - Manual (Page 208)

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Care and Maintenance
Your mobile device is a product of superior design and craftsmanship
and should be treated with care. The suggestions below will help you
fulfill any warranty obligations and allow you to enjoy this product for
many years:
Keep your Samsung Mobile Device away from:
Liquids of any kind
Keep the mobile device dry. Precipitation, humidity, and liquids
contain minerals that will corrode electronic circuits. If the mobile
device does get wet, do not accelerate drying with the use of an
oven, microwave, or dryer, because this may damage the mobile
device and could cause a fire or explosion. Do not use the mobile
device with a wet hand. Doing so may cause an electric shock to
you or damage to the mobile device.
Extreme heat or cold
Avoid temperatures below 0°C / 32°F or above 45°C / 113°F.
Microwaves
Do not try to dry your mobile device in a microwave oven. Doing so
may cause a fire or explosion.
Dust and dirt
Do not expose your mobile device to dust, dirt, or sand.