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Well this ain't the first high end phone to have such issues:----
HTC EVO suffering from glass separation issues?
Potential bad news for EVO owners: we're seeing plenty of reports from folks having issues with the lower portions of their screens. Conspiracy theories say that the adhesive holding the glass is failing, causing the screen to peel up a bit and embark on a very slow journey to capacitive independence. This separation is causing excessive light leakage from below, a problem that we noted in our review but apparently gets continually worse as users spend more time massaging their screens -- even those not being as hard on theirs as this guy was. No official response from HTC yet and we're not sure just what a fix could be, but we have seen people do some wonderful things with duct tape.
HTC EVO suffering from glass separation issues? -- Engadget
here's another one :-----
We're not sure if he's doing something particularly weird, like holding the metal antenna in such a way that it's shorting out. But it is strange. Or, it could be just a bug in the software, showing no bars and no reception even when you do have reception. But, he does hold the phone with the glass, and it doesn't have this reception issue.
iPhone 4 Loses Reception When You Hold It By The Antenna Band?
--- Updated Post - Automerged ---
Update:------- Apple says that this(no bars issue) is a bug it plans to fix, and that it has to do with the way the bars are presented, not the actual ability to make a call. And, in fact, in nearly all of these cases, the iPhone 4 was able to place calls despite the lack of bars."