I live in an area with mostly EDGE only. With my 3GS since June I have "no service," most of the time. When I pop the sim back into old 3G phone, signal is fine! In a big city, the 3GS is fine as well. Did Apple purposely make the signal worst in non-3G areas, or might there be something wrong with my 3GS? I mean this is a night and day difference. Many thanks.