I remember having a similar issue on my 4S on iOS 5 where it would lose a signal while locked and wouldn't connect back until I woke the phone up. It happened both on stock (iOS 5.0, 5.0.1, 5.0.1r1, 5.1, 5.1.1) and jailbroken (iOS 5.0.1, 5.0.1r1, 5.1.1) it wasn't until iOS 6 when it stopped doing that. On iOS 7 I didn't have that problem but I was stock (I didn't get a chance to jailbreak it). The only other issue I had was if cellular data was off for more than 24 hours, when I turned it back on it couldn't find a cellular connection until I toggled airplane mode on & off.
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04-28-2014 10:07 AM