Having terrible AT&T reception I decided to try this test with both of my 3Gs iPhones. Although I got the test results and saw the number (-90 to -72 at different times) I never got the screen which the poster has shots of. ALSO, after ending the calls one of my phones is stuck on the number representation as opposed to the bars representation. Rebooting the phone does not seem to help. It probably makes no difference if a bar or a number tells me I have lousy reception, but I'd rather have the phone display bars as intended. Did I do something wrong? How can I get back to the bars representation?
In the not too distant future I'll be eating the cost of my contracts and buying new phones with Verizon. When I put these up on EBAY I want to make sure the phones are in great condition . . . even if the service they are designed to work with rots.
Just touch the signal area on the black bar where it says AT&T and it should switch back.