Last month amid a string of exclusive reports detailing just about everything there is to know about Amazon’s first smartphone, BGR reported that one of the handset’s key selling points will be a special data plan called “Prime Data.” Our sources were able to confirm as much, however details surrounding the special new plan were not known at the time. Multiple sources told us that Amazon’s phone would likely be an AT&T exclusive in the U.S., and they speculated that Prime Data could be an offering that provides free streaming of Prime videos and music that will not apply toward users’ data caps.

Now, one of the last few puzzle pieces has fallen into place.

The Wall Street Journal on Tuesday confirmed our earlier report that Amazon’s first phone will be an AT&T exclusive. The report cites multiple unnamed sources and offers no other new details.

For more on Amazon’s upcoming smartphone, which is set to be unveiled during a press conference on Wednesday, check out our Amazon smartphone hub.