My guess is that it’s a MVNO issue, i.e. a false roaming indication.What operator do you have, and where do you live?
In the UK, for instance, there are almost 30 operators (among them Asda, Sainsbury’s, Virgin and Co-Op) that all use the EE (physical) network. It might well be that the FP OS hasn’t taken all of them into account (in that case it will probably be solved in a later OS update).
And I’m pretty sure that it isn’t possible to roam on another national network (except for emergency calls, of course). So I really don’t think you need to worry. I lived with the ‘R’ indicator myself for some months (due to an unrecognised MVNO) until a FP OS update solved the problem.
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