CNET just received an e-mail from an AT&T press representative, informing us that starting April 8, iPhone customers on their network will be able to unlock their iPhones:
"Beginning Sunday, April 8, we will offer qualifying customers the ability to unlock their AT&T iPhones. The only requirements are that a customer's account must be in good standing, their device cannot be associated with a current and active term commitment on an AT&T customer account, and they need to have fulfilled their contract term, upgraded under one of our upgrade policies or paid an."
Aside from those few stipulations, this is a dramatic turn in the carrier's previous policy, which kept customers' iPhones on lockdown since 2007. So if you want to keep your device, but want to switch to T-Mobile or whatever floats your boat, jailbreaking will not be necessary.