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AT&T’s new policy of unlocking iPhones that are out-of-plan is big news, but there is no company that could reap more rewards from this new policy than the United States’ other GSM carrier T-Mobile could. Magentaa happens to carry iPhone compatible Micro-SIMs and is rapidly developing its HSPA+ 1900MHz spectrum for just such an occasion. In fact, even with EDGE speeds and AT&T’s previous locks, over a million iPhone owners and counting have chosen to go to T-Mobile.

A T-Mobile spokesperson told 9to5Mac today:

Today we have more than one million unlocked iPhones running on our network. T-Mobile currently offers microSIMs for customers who already have a GSM phone they want to use on the T-Mobile network, including an iPhone. In order to set up an unlocked iPhone on T-Mobile’s network, customers simply need to purchase a microSIM card and select a T-Mobile Value plan that suits their needs.

T-Mobile’s Value plans enable customers who bring their own smartphone, such as the iPhone, to save money. For example, T-Mobile’s Value family plan with unlimited talk, unlimited text and unlimited data with 2 GB of high-speed data is just $49.99 per line for two lines.

In addition, we will continue to deliver more value to customers as we expand and modernize our 4G network. Beginning this year, we will introduce HSPA+ service in our 1900 MHz PCS spectrum. When we do, our 4G network will be compatible with a broader range of devices, including the iPhone.

The $99.98 Family plan is a pretty incredible deal, especially when the lowest two-person family deal on AT&T runs about $130 (2x 3GB) before the taxman cometh.

We are also hearing tales of T-Mobile iPhone owners showing HSPA+ (3G/4G) on their iPhones along the Eastern seaboard. Please let us know in the forums if that is the case.

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