Just got the 3GS at the at&t store, via adding a new line. Girlfriend gets the old 3G. Had at&t do a sim swap (actually I think they gave me a new sim for my main line, which they then put into the 3GS) and then gave me the sim from the 3GS to put into the 3G. I'm now noticing that although the 3G can make/receive calls just fine with the new sim, the "signal type" indicator doesn't show. i.e., I have full bars, but no 3G or E indicator at the top left. Anyone seen this before or had this situation?