Iphone loses signal then cannot refind it.

Hello,
        If my iphone loses its signal for any reason it cannot then refind it, unless I turn it off and then on again. This happens if I use airplane mode, or if I pass through a no-signal area (this happens frequently, unfortunately, I live in a remote place), or sometimes even if there is a brief signal interruption.
Obviously turning off and on is no great hardship, but if I don't notice then I miss calls when the signal is absent.
Is this some simple probelm to solve, or is it a tricky one? Anyone else had anything similar?

Hooray! Seems to be sorted by 5.1

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