We've been to Disney with TMobile at least 4 times, and only experienced a few blackout areas...inside the foodcourt at POP Century (a couple years ago) and this past January when I was holding 4 trays all by my lonesome outside of Flame Tree BBQ in AK. Those are the only I can think of off the top of my head. Of course, this may have something to do with my phone model as I only get the free or slightly upgraded model.