"When you get this error "Service is not available
Erorr: 06-07-5920 Contact Virgin Mobile at your Service 1-888-322-1122" open your dial pad and dial ##847446# after you finis a menu will come up select edit and a box will open enter 10 zeros in
MDN and 10 zeros in
MSID then select ok the phone will restart then try activating again, that work for me. Hope ith helps you."
i just googled the error and found this responce... it actually did work for the OP from the thread it was in however this was for the intercept.... possibly worth a shot tho...
just remember what the mdn and msid are now if you try it