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Earlier this year, T-Mobile USA听announced it would do away entirely with contracts and instead allow consumers to purchase an unsubsidized phone and pay for unlimited service on a month-by-month basis. Some onlookers skepticism that it was really such a great deal for consumers 鈥� even if the "un-carrier" plan also arrived in lockstep with the long-awaited of the T-Mobile iPhone 5.听

But today T-Mobile affirmed that the whole thing is working very well, thank you very much.

How well? Let's go to the numbers: According to T-Mobile, in the second quarter of 2013, the company added听1.1 million new customers, including听685,000 contract subscribers 鈥� apparently the strongest growth that T-Mobile has enjoyed in four years. Unsurprisingly, revenue is , by 27.5 percent year-over-year.听

"T-Mobile's Un-carrier approach has clearly resonated with consumers," T-Mobile chief John Legere said in a statement.听"By fixing the things that drive them mad, like contracts and upgrades, and freeing them from the two-year sentences imposed on them by our competitors, they are choosing the new T-Mobile in unprecedented numbers."听

T-Mobile is currently the fourth-largest carrier in the US, Verizon Wireless, AT&T, and Sprint. Obviously the second quarter numbers are extremely good news for T-Mobile. But some analysts have wondered whether this isn't a temporary bump that can be attributed to the iPhone 5 and the noise surrounding the initial "un-carrier" announcement.听

"The question remains as to whether [T-Mobile] can sustain the performance in postpaid as the iPhone buzz fades and competitive intensity rises,"听New Street's Jonathan Chaplin cautioned in a research note by Reuters.听