I have a chance to buy a used iphone. However randomly during a conversation a buzzing noise can be heard by the person on the other end, even though it can't be heard on this end. Any advice? I also wonder if there is a way to put my ATT sim card in that has the unlimited media package for a nonsmart phone and it work in the iphone. I can't afford to pay any more money to ATT than my $250 a month bills now. I have been paying for media package for years and haven't been able to use it since ATT bought Cingular out. My phone will randomly get a page or two to come up, but I had a 3G HTC fuze on the smart package and it would never load unless I traveled into 3g area. Lately I have had a new sim card and new media package for LG phone. Can get a little, but phone stinks. I want to try using iphone for a bit with my current nonsmart phone plan price to see if I like it before investing more.