I just came back from a trip to Las Vegas and was so annoyed that I couldn't make phone calls or texts inside/near buildings. I know that glass and the metal structures do affect reception, but my phone pretty much became an iPod touch the whole trip. Almost the entire group of people I came with (15+) had AT&T iPhones and the other two were Sprint. Reception for sprint phones were fine. I guess it has something to do with CDMA and GSM. Anyone else have the same issues in Vegas?