Based on the model that we saw at the FCC, the version of the Samsung Galaxy S4 that MetroPCS will offer won't feature HSPA+, but will support 4G LTE connectivity. T-Mobile's plan is to eventually get Metro customers to migrate over to T-Mobile. The latter said last month that it is ahead of schedule with the migration. And with 60% of MetroPCS customers upgrading to a new phone every year, the migration should be complete by 2015. But before it is done, and two carriers become one, Metro PCS customers will get a chance to sport their own Samsung Galaxy S4.
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source: Twitter via Engadget