After using the field test mode (dialing *3001#12345#* )today my iphone 3G is stuck displaying decibels in stead of signal bars. Normally it goes back to bars when leaving the field test mode. I have tried turning airplane mode off and on, as well as power cycle and full reset. I guess I may have to do a restore when I get home. Has anyone had this happen to them? I'm running the latest 2.02 software.