AllThingsD was able to sit down with T-Mobile CEO Philipp Humm, who offered insight into why the carrier hasn't yet come to a deal with Apple to officially carry the iPhone on their network.
“The key reason we didn’t have the iPhone in the past is we are on different band than globally the market was,” Humm said. “That is something which will change over time. Chipsets are also evolving to be able to allow for more bands.”
This, however, will change with the failed merger attempts from AT&T. When the deal fell apart, T-Mobile walked away with a cool $3 billion and additional AWS spectrum needed to support a device like the iPhone.
However, Humm also pointed out that, even with more spectrum and newer chipsets, Apple would still need to add that AWS support to the iPhone. If they don't, nothing else T-Mobile does or wants matters.