Answer: 

Dan got the Bell cell phone, Brian got the Sprint cell phone, and Joelle got the AT&T cell phone.

We know Dan didn't get the AT&T, so he could have gotten the Sprint or the Bell.
But someone else got the Sprint, so Dan had to get the Bell.
Furthermore, we know that it was Brian who got the Sprint, because he is the only man in the group besides Dan.
So that leaves Joelle with the AT&T.