Filed under: iPhoneOnce upon a time, iPhones had an OS update known as version 2.1, and there was much rejoicing. Actually, there was a little bit of the rejoicing and a bit more of the griping.
What was the griping about? Well, some of you kiddies might not remember this, since it was so two years ago, but the story may ring familiar: it was all about degrading signal indicator issues with the iPhone 3G.
Part of what that article notes is the existence of the field service test mode that was, then, present in the iPhone OS. It used to be pretty trivial to access this mod
