Our tech group said there was a way to define the MAC address of the devices for the micro cell, but they had not done this before.
We are supposed to be moving to AT&T for the work cell and my personal cell is already on AT&T. My office is in Atlanta and Sprint has good coverage over the metro area. However, my work sends me all over the state of GA and outside the main metro areas and more than 1/2 mile away from an interstate, Sprint seems to be non-existent. So with the pending move, I figured I would just wait and see on the Sprint micro cell
PS - Our family phones are AT&T and the coverage is much better in the sticks than with Sprint in GA.