A pretty high up source has told The Boy Genius Report that the AT&T data plan that will come with the iPhone will cost between US$34.99 and US$44.99 per month and will feature unlimited data and either 2000 text messages or unlimited text messages. The data plan could even be known as the iPlan (although that could be an internal name only).
With four days to go before the iPhone release, we should know very soon if this is just another rumour or the real deal.