By PETER SVENSSON T-Mobile CEO John Legere speaks during a news conference Tuesday, March 26, 2013 in New York. T-Mobile will start offering the iPhone 5 on April 12, filling what Legere said was “a huge void” in its phone lineup. The company is currently the only major U.S. carrier not to offer Apple’s popular smartphone. (AP Photo/Mary Altaffer) NEW YORK (AP) — T-Mobile USA on Tuesday said it will start offering the iPhone 5 on April 12, filling what its CEO said was “a huge void” in its phone lineup. T-Mobile, the fourth-largest of the national U.S. phone companies, has been losing customers to the bigger companies, which all sell the iPhone. “This is a big deal for us,” T-Mobile CEO John Legere said at an event in New York. The company is charging $100 up front for the iPhone 5, then another $20 per month for two years. That’s on top of service fees for voice, text and data that start at $50 per month. The total monthly cost starts at $70 per month, a substantial discount to prices offered by bigger companies. T-Mobile’s network has, until recently, not been able to offer high-speed data service to iPhones. It’s now able to deliver high-speed data to iPhones in some cities, and it has lured over 2.1 million off-contract AT&T iPhones, executives said Tuesday. The company also announced that it is firing up an even faster data network, based on so-called “LTE” technology, in Baltimore, Houston, Kansas City, Las Vegas, Phoenix, San Jose, Calif., and Washington. Unofficially, the network is also active here and there in New York, as demonstrated at the event. By the end of the year, T-Mobile says it will be available where two-thirds of the nation’s population lives. The iPhone 5 can access the LTE network for faster data downloads. T-Mobile is the last of the four major carriers to launch an LTE network, but already has a relatively fast “4G” network. It’s been hamstrung by a lack of space on the airwaves, but gained some room last year from AT&T as part the compensation for a failed buyout attempt. T-Mobile also said it will start selling the Samsung Galaxy S 4 on or around May 1. That’s the successor to the Galaxy S III, which has been the chief competitor to the iPhone. The announcement comes just days after T-Mobile ditched its conventional contract-based plans in favor of selling phones on an installment basis. It’s separating the cost of the phone from the service, and when a phone is paid off, usually after two years, the monthly fee for the phone disappears from the billing statement. On traditional contract-based plans still used by the other carriers, the buyer is deemed to have “paid off” the phone after a certain period, at which point the customer becomes eligible for a new, subsidized phone. The monthly payments, however, don’t decline if the customer keeps the old phone. There’s no service contract, so customers are free to jump from T-Mobile to another carrier at any point, but they’ll still be paying off their T-Mobile phone in monthly installments. T-Mobile is positioning the change as a radical departure from industry practices, and is basing a new advertising campaign on being the “Uncarrier.” “We’re cancelling our membership in the carrier club,” Legere said. As before, T-Mobile’s prices generally undercut those of the bigger phone companies. The chief weakness is that its data network coverage is poorer in rural areas. “T-Mobile realizes that they have to change the rules of the game, because under the current rules, they’re losing, and they’re going to continue to lose,” said telecommunications analyst Roger Entner at Recon Analytics. He’s skeptical that the plans, alone, can change its fortunes. “Even if they’re $5 cheaper, will that be enough? They’re already charging a significant discount to Verizon and AT&T, and they’re losing customers,” Entner said. T-Mobile is a unit of Germany’s Deutsche Telekom AG, which has agreed to merge it with No. 5 carrier MetroPCS Communications Inc. That deal faces opposition from shareholders of MetroPCS, which provides only prepaid service. By coincidence, the shareholders are voting on the merger on April 12, the same day T-Mobile starts selling the iPhone.