AT&T just pushed out a press release announcing that it will be carrying the iPhone 5. As Apple announced, customers will be able to pre-order it on September 14, or purchase it on the 21st.

But far more interesting is the fact that AT&T also mentioned in the press release that customers that still have unlimited data plans, will be able to keep using them with the new iPhone…

9to5Mac points to the release, which indicates that customers who have had their unlimited plan since the original iPhone will be able to keep it and still buy an iPhone 5 at the subsidized price.

““We are thrilled to offer iPhone 5 on the nation’s largest 4G network. We’ve worked with Apple since the original in 2007 and this is hands-down their best phone yet,” said Ralph de la Vega, president & CEO, AT&T Mobility. “We offer customers the flexibility to keep the iPhone data plans they already have or choose any of our individual or new Mobile Share plans.”

This is great news for AT&T customers, as users with unlimited plans were expecting to lose them upon upgrading to the iPhone 5. Verizon, for example, will be forcing upgraders to switch to a new data plan.

Keep in mind, however, that customers won’t be able to make FaceTime calls over cellular on their unlimited plans. And we’re not sure if they’ll be able to utilize AT&T’s LTE network. But hey, at least it’s something.