T-Mobile's iPhone Is Unique Variant of AT&T's Model
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NOT quite Unique!
http://www.anandtech.com/show/6860/apple-to-ship-upd ... »
But yes, you must buy a new t-mobile iphone 5 to get the AWS HSPA+ support. I'd bet at&t pushed against a firmware update on existing iphones.
Not exactly accurate
The A1428 iPhone 5 variant has always possessed the physical capability for W-CDMA 2100+1700 (i.e. AWS). However, Apple implemented a software lock out to appease AT&T. The software lock out is being...
Will wifi calling be available?