I have the same problem with my XA1, except only when I am thousands of miles from home and don't have a windows computer to do a data fix. It is happening on my main phone number and I don't have another sim to put in there, thus making me inaccessible by phone for emergencies etc. The irony is that this same phone and sim worked in the same place I am now having problems 6 months ago. I have tried just taking out the sim and putting it back, but that doesn't work.
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