A few tips worth trying if your 1.1.3 firmware iPhones signal bar drops to zero
...worth trying in order to help restore your iPhones proper signal, at least near where it should be. We certainly dont understand why it is behaving the way it is, but the signs of the problem are mainly
Signal dropping suddenly to zero or very low without any warning
Or the display of the message Call failed
And most annoying and frustrating...
