Either an exclusivity window with other carriers has passed or Apple needed some time to figure out how to sell and activate devices with Uncarrier service, but the wait is over - you can now waltz inside an Apple Store and safely buy and activate an iPhone on T-Mobile's prepaid service.
To sweeten the deal, Apple and T-Mobile are treating customers who buy an iPhone with a prepaid T-Mobile plan to a cool $50 discount, for a limited time. Moreover, folks buying an iPhone with T-Mobile's Simple Choice plan will receive a $50 iTunes gift card...