Samsung SGH-T809OKATMB - Manual (Page 192)

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• Do not put the phone in or on heating devices, such as a
microwave oven, a stove or a radiator. The phone may explode
when overheated.
• If your phone is equipped with an external antenna, use only the
supplied or an approved replacement antenna. Unauthorized
antennas or modified accessories may damage the phone and
violate regulations governing radio devices.
• If the phone, battery, charger or any accessory is not working
properly, take it to your nearest qualified service facility. The
personnel there will assist you, and if necessary, arrange for
service.