"Today, T-Mobile launched its state-of-the-art 4G LTE network in seven major metropolitan areas, including Baltimore; Houston; Kansas City; Las Vegas; Phoenix; San Jose, Calif.; and Washington, D.C.," its news release said.
T-Mobile, which announced in December it had reached an agreement with Apple, is the last major U.S. carrier to sell the iPhone. But this is a big deal for current T-Mobile subscribers because the new no-contract option will allow them to switch phones more easily and for less money over time.
With T-Mobile, this is the first time Apple's iPhone is available on all four major U.S. mobile carriers. Sprint, Verizon and AT&T all offer the iPhone. AT&T was the first to carry Apple's iPhone when it debuted in 2007.
For lack of the iPhone, a high-speed LTE network and some other benefits, T-Mobile fell behind the other major U.S. carriers and lost customers. But 2013 might be the year the carrier turns it around with its plans to acquire Metro PCS, launch its LTE network and now offer those all-important Apple products.
ABC News' Tech Editor Joanna Stern contributed to this report