Samsung SGH-A257URAATT - Manual (Page 108)

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• 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.