T-Mobile is more than a little eager to justify its acquisition of MetroPCS . To its relief, there’s early evidence that the money was well spent: it says that MetroPCS’ switch to a blend of HSPA+ and LTE is ahead of schedule, and it cites the just-started Bring Your Own Phone program as proof. The bigger carrier is already planning to expand MetroPCS’ device mix, too. In addition to the recent launches of the Galaxy Exhibit and Optimus L9 , T-Mobile’s refreshed Galaxy S III is due on June 17th. We won’t declare the transition a resounding success just yet, however — when T-Mobile only expects to finish converting MetroPCS customers by 2015, there’s still a lot of ground left to cover.