For those of us with jailbroken iPhones, who want to have a numeric GSM signal strength displayed instead the standard signal bars, just install QuickGold through Cydia, and then search for, and open FieldTest. Now you can just tap on the signal bars and make them change to a numeric signal. As of now the reading goes back to the regular bars when you exit FieldTest...I really want to find out how to get the numeric battery info back.
