T-Mobile USA and Apple have signed an agreement that will bring iOS devices to the fourth-largest carrier in the U.S. in 2013. Deutsche Telecom CEO Rene Obermann announced the news during an investor meeting. Unfortunately, details have yet to be announced.

According to a press release:

In addition, T-Mobile USA has entered into an agreement with Apple to bring products to market together in 2013.

What we don’t know, of course, is when in the next year Apple products will make their way into T-Mobile showrooms, and what those products might be.

We can almost certainly expect the iPhone 5 to be the first product on the list. T-Mobile has tried often in recent years to get Apple’s flagship product. In addition, cellular versions of Apple’s iPad with Retina display, and the iPad mini will also likely arrive too.

Currently, T-Mobile USA has 33 million customers, behind Verizon Wireless, AT&T, and Sprint.  In recent months, T-Mobile has improved their network, in part to support customers that have unlocked iPhones.

As Brent Dirks reported at the time:

And the improvements seem to be more than just talk. In internal testing by T-Mobile, an unlocked iPhone 4S running on its HSPA+ network averaged 70 percent faster download speeds than the same handset running on AT&T’s network. And unlike AT&T, T-Mobile also has unlimited data plans.

As more about this news emerges, we’ll let you know.