AllThingsD:

“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.”

T-Mobile USA uses a different part of the GSM spectrum than AT&T and other GSM carriers.

In a separate article, T-Mobile CEO Philipp Humm told AllThingsD that “there is no second AT&T deal around,” though the company did net cash, spectrum and a data-roaming agreement.