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Apple is well-known for taking pride in the thinness of its devices. So we should expect its next-generation iPhone to be among the slimmest smartphones on the market. Back in January, we told you that the upcoming iPhone - possibly called iPhone 6 or iPhone Air - would have a 6mm-thin body. Now, insider Sonny Dickson says that the new iPhone model will actually be 0.22 inches thin - meaning only 5.58mm.Sonny Dickson also mentions that the next-gen Apple handset would sport an Ultra Retina screen with a 389ppi density, while its alleged A8 processor should be clocked at 2.6GHz. He also tweeted that “these specsbe the real thing”, so they could also be inaccurate. While there’s no denying that the man has some connections (he was the first to reveal last year’s iPhone 5C design), we’re still taking all these details with the proverbial grain of salt.Anyway,let’s assume that the 389ppi density is real. We heard that the iPhone 6 may feature a 4.7-inch display, and, if that’s the case, to obtain a 389ppi density at that size, the resolution should be higher than 720p (720 x 1280), but lower than 1080p (1080 x 1920).Apple might officially announce the iPhone 6 in September this year. The company could also introduce a larger, 5.7-inch iPhone to counter the multitude of very large Android (and even Windows Phone) handsets released lately. Both should run iOS 8 . Hopefully, more solid details about Apple's future smartphones will be unveiled soon.