When my Captivate shows the 3G symbol my bars drop from none to maybe 1 bar and signal strength will drop down to -117 to 0 dBm. When the 3G symbol disappears my signal strength bars go up to 4. This is in my home. WHY does this happen and how can I disable 3G so I can use my phone as a phone and get somewhat decent call quality? Update I found this: Dial *#*#197328640#*#* Select  DEBUG SCREEN Select  PHONE CONTROL Select  UE STATE CONTROL If you want 2G, select:  CHANGE RAT TO GSM If you want 3G, select:  CHANGE RAT TO WCDMA It works 'til you reboot.