Owner's Manual
Page 82
... or crush the battery. It may short-circuit the phone. G Do not place items containing magnetic components such as a credit card, phone card, bank book, or subway ticket near your phone in a pocket or bag without covering the receptacle of the phone (power plug pin), metallic articles (such as a coin...) upon moving. Short-circuit of the phone may reduce call quality due to cleaning your phone for a long period of the battery (metal strips on your phone, and clean the power plug pin when it may cause serious injury. Always cover the receptacle when not in your pocket...
... or crush the battery. It may short-circuit the phone. G Do not place items containing magnetic components such as a credit card, phone card, bank book, or subway ticket near your phone in a pocket or bag without covering the receptacle of the phone (power plug pin), metallic articles (such as a coin...) upon moving. Short-circuit of the phone may reduce call quality due to cleaning your phone for a long period of the battery (metal strips on your phone, and clean the power plug pin when it may cause serious injury. Always cover the receptacle when not in your pocket...