AT&T is terrible at managing their network compared to T-Mobile. And the service and support has only really begun improving late last year. It will take quite a lot of time for AT&T to catch up in terms of overall quality to the levels expected by T-Mobile customers. And AT&T will crush T-Mobile’s open culture after the acquisition is complete, in favor of AT&T’s monopolistic conservative culture.

AT&T also doesn’t really get open networks and open solutions. Their Android devices are locked down, with sideloading blocked. They are the only carrier in the world that does that, by the way. AT&T prefers nickel-and-diming customers instead of making them happy enough to continue staying with AT&T, which is why they chose femtocells instead of UMA. UMA did exist before femtocells, by the way. UMA was built into the GSM standard with the EDGE and UMTS standards. In fact, femtocells rely on a variant of UMA technology to work. If AT&T acquires T-Mobile, they’ll probably kill off the G-series of Android devices, the ones that are pure Google Experience devices. UMA will probably disappear as well. And of course, no more Even More Plus plans and unlimited data plans.