I want to use my 8 GB 3G as a Skype phone but and thoroughly confused about microphones/headsets. I have seen no advertised ones that say they are compatible with a 3G 8GB Itouch. Most ads say 32/64 GB 2G or 3G. Even the overpriced ones that Apple sells in their store only say 2G for Itouch. I understand that that the four rings on the plug (left ear, right ear, gnd and mic) have to line up, but can't tell which ones will. I would appreciate some clarification on this.