My brother is having Verizon XV6800 mobile phone with him everything thing was working fine few days ago he was able to send and receive sms and calls and run some application also in the mean while he had made some changes in changes in his bluetooth registry keys and after which whenever he makes any call he is getting an message as Unable to authenticate your phone. he has come for help at my place i guess Hard reset would solve his problem can anyone tell me whats is the procedure for resetting Verizon XV6800 cell phone.
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