25 ways to check the hardware on your iPhone 4

What I came up with is a series of hardware checks that anyone can perform right after taking an iPhone 4 out of the box and syncing it for the first time. This is by no means the only way to test an iPhone 4’s hardware for defects, and there are probably more comprehensive methods out there, but the following procedure is basic enough for almost any user to follow. Plus, it should catch any glaring hardware defects in an iPhone 4 right away — via The Unofficial Apple Weblog