My 4S has a 'buzzing' from the earpiece when on a call. Searching the web, it seems like this is a common problem. Unfortunately, threads seem to descend into 'you're an idiot, Apple is perfect'.

This place seems to be a bit more sophisticated. So, anyone on here experiencing the same? If its not common, I'll try and get a replacement.

I had a iPhone 4, and that was fine, albeit on a different network (O2 -> Vodafone)

Cheers,
Rick