iPhone shows up on T-Mobile; is it the 4S or the 5?

Over the weekend BGR posted some photos of what appears to be a white iPhone being field tested on T-Mobile. The device is shown with two special field-testing apps. Could it be the iPhone 4S?

Source: http://www.zdnet.com/blog/apple/iphone-shows-up-on-t-mobile-is-it-the-4s-or-the-5/10009

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