Hello, on a couple iphones i work on, i get full reception after following the unlock procedures, but sometimes if the battery would die out, or if i turn on and off my phone the reception will not regain, the signal in the top left corner of the iphone screen stays as dots. anything i can do to avoid this problem, like anything i can enter into terminal, or what's the best way to regain signal if i turn on and off the phone. thanks.

