Why my phone shows not reachable even it has full signal?

I love my honour 4x very much.but what happened to it I don't know.Suddenly it started to give message 'not reachable ' while any one calls me ,even though it has full tower.And if I try to call any one the call cuts automatically.But when I kept the same sim in another phone it didn't shown any 'not reachable ' message while any body calls to that sim.It means the problem is in my phone(i.e.honour 4x).I think this problem might have started after the phone is updated.battery power was also decreased.PLEASE SOLVE THIS PROBLEM,IF ANY ONE KNOWS.

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