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A photo of the product, also licensed for use with Apple's line of iPods, was provided by an anonymous source to Engadget on Friday. The source indicated that T-Mobile's corporate stores in the U.S. will now carry the cables, leading to speculation that their stocking could be in preparation for an iPhone launch.
Since the device debuted in 2007, the iPhone has been exclusive to AT&T in the U.S.
The USB cable could also be seen as evidence that T-Mobile will begin selling the iPad. Apple recently partnered with Verizon — another carrier that does not sell the iPhone — to sell its touchscreen tablet last month. However, T-Mobile's retail box makes no mention of the iPad.
The apparent availability of the product comes as a T-Mobile executive this week blamed the company's poor performance on the fact that it does not sell the iPhone in the U.S. The carrier has 33.76 million customers, making it the smallest of the four major wireless carriers in America.
T-Mobile this week also released a new advertisement parodying Apple's "Get a Mac" commercials, and suggesting that the iPhone 4 is held back by AT&T's network. The carrier is advertising its expanding HSPA+ network as "America's Largest 4G Network."