So what information is available in field test mode? Quite a lot, as it turns out: network info, cell info, GPRS (primarily used for GSM digital cellular technology, hmmm!), PDP (packet data protocol, presumably), call information (handy if actually taking a call), and Versions--which amusingly has a misspelled Firmware ("Firware") version unless that's some technical term that I'm simply misunderstanding. Anyway, tap on Refresh to update the info or tap Home to return to your normal iPhone interface. Update: You can't store this sequence as a contact; sorry, it just doesn't work. You have to enter it by hand each time.