It sounded good. Buy an inexpensive GoPhone and transfer service to an iPhone, add the $20/month data plan and save roughly a thousand dollars over the two-year contract period. Things that sound good are often too good to be true. This was. Today, AT&T officially announced that GoPhones are no-go as far as iPhone upgrades are concerned. GoPhone customers cannot transfer their service, instead, they must activate their iPhone as a new account with a new phone number.