Officially from the T-Mobile Blog:

Will refarming make your network compatible with the iPhone? And will you stop offering 2G services? A nice side benefit of the refarming effort is that our 4G network will be compatible with a broader range of devices, including the iPhone. The other important benefit of our network modernization effort is the coverage improvements it will deliver, especially when it comes to in-home coverage. As we refarm our 1900 spectrum, we will continue to fully support our customers with 2G devices.

The move is a result of the “re-farming spectrum” from the botched AT&T merger.

We are also going to make more effective use of the spectrum we already have by refarming a portion of our 1900 MHz PCS spectrum to support HSPA+ services, which frees up additional AWS spectrum for LTE. With the AT&T breakup spectrum factored in, T-Mobile will have sufficient spectrum to roll out LTE with 20MHz to about 75% of the top 25 markets in 2013. Most remaining markets will have 10MHz. Our course, we’d love to have more spectrum to further strengthen our position to compete in the marketplace.

T-Mobile executives told analysts as much last month, but this is the first official word on T-Mobile’s website. We are hearing that 3G iPhone owners on T-Mobile could start seeing access in areas like Philadelphia in a matter of weeks.

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