I have an iPhone 3g that I just bought about a month ago, it was an upgrade from the original model. When it is charging via the power adaptor and I get a phone call and have the phone up to my ear I can hear an electrical buzzing and if i move it slightly I feel a little shock on my ear like an electrical discharge or something. I'm pretty sure this isn't normal and want to know if I should get it checked out. Anyone else having this problem?