Hello all ;-) Im new to this forum so please bare with me..I recently purchased a brand new unlocked HTC Tattoo from overseas, I live in the United States and my carrier is AT&T. My question is the HTC tattoo is a quad band phone that runs off of frequencys gsm/gprs/edge: 850/900/1800/1900...which are excactly the same bands that at&t uses for there 3g network..I made sure the phone was going to be able to read those specific bands before purchasing. To my dissapointment when I inserted my sim card all my phone would recieve is At&t edge network (2g). I called At&t customer service and of course they couldnt figure out why my phone wasnt recieving the 3g signal. I then called HTC customer service and they told me that its true that my phone is a quad-band phone but apparently its the european version??? FRom what he told me is AT&T does use the bands 850/900/1800/1900 but that they are in the (UMTS) versions of the bands...can enyone explain this to me..what is the difference from (GSM) and (GSM)UMTS)..he told me that my phone will recieve 3g coverage anywheres else in the world practically but the united states...im very dissapointed at this news being that I just got my phone and it kinda renders it useless if I can't use it on the 3g network. Does anyone else have any answers??????????