Right, but remember the 635 came with Windows Phone 8.1 to start with, and an updated version of WFC that supports MMS unlike the 521/925/8X version of WFC... I also have the HTC One M8 Windows phone and battery life is exceptional on there, too. But it came with 8.1 Update from the start and it doesn't have T-Mobile's WFC driver (it's the Verizon Wireless version).
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