Previously, my iPad received 3G signals just fine. However, now it only connects in the lower speed Edge mode. My iPhone 4, sitting right next to it, has no problems connecting in 3G mode. They both show a signal strength of 4-5 bars. The problem seems to have started during a recent trip abroad when I swapped SIMs to receive service in Turkey. I was very happy to have a network connection wherever I was traveling, but I noticed that I was only getting an Edge signal. But now that I'm back in the US, and have swapped back to my AT&T SIM, I am still not receiving in 3G mode. Any suggestions?