T-Mobile USA Senior Vice President Andrew Sherrad in an interview with The Verge, that the carrier would be skipping their original plans to introduce an even faster 84Mbps network, in favor of moving straight to an LTE based one. The move is for a few reasons. For one, T-Mobile wants to continue emphasizing their WiFi calling feature and currently, their UMA based service can’t support when a customer is on a WiFi call, and leaves their wireless network — the call will drop. But once T-Mobile gets on board the LTE train, this will no longer be a problem with the new network transitioning seamlessly between the two.
That isn’t to say T-Mobile will just drop everything in their move to LTE. T-Mo will continue rolling out their plenty fast 42Mbps HSPA+ network while getting ready for LTE in 2013. And really, that network seems to be holding up pretty well compared to their nearest competitor, Sprint’s 3G/4G network.
Source: Android Phone Fans