Samsung SGH T719 User Manual page 202

Do not use or store the phone in dusty, dirty areas, as its moving
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parts may be damaged.
Do not store the phone in hot areas. High temperatures can shorten
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the life of electronic devices, damage batteries, and warp or melt
certain plastics.
Do not store the phone in cold areas. When the phone warms up to
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its normal operating temperature, moisture can form inside the
phone, which may damage the phone's electronic circuit boards.
Do not drop, knock or shake the phone. Rough handling can break
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internal circuit boards.
Do not use harsh chemicals, cleaning solvents or strong detergents
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to clean the phone. Wipe it with a soft cloth slightly dampened in a
mild soap-and-water solution.
Do not paint the phone. Paint can clog the device's moving parts
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and prevent proper operation.
Do not put the phone in or on heating devices, such as a microwave
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oven, a stove or a radiator. The phone may explode when
overheated.
If your phone is equipped with an external antenna, use only the
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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
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properly, take it to your nearest qualified service facility. The
personnel there will assist you, and if necessary, arrange for
service.
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