I bought into the iPhone hype about two weeks ago and am already on my third iPhone! The first one had a nick in the back plastic moulding so I instantly got that exchanged! The second one had a dodgy gasket which made the front glass loose in the top left corner and now my third may have a problem! Has anybody else experienced buzzing within the earpiece (on the phone, not the headphones) when taking a call? Its not the GSM interference 'duh duh duh duuuhh duh dh' noise but a vibrating noise more like 'zzz zzzz zz zzz zzz' as if the speaker is faulty as I only have the speaker volume set half way! Is this expected or should I be taking it back...again?