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Hello before you contact mobile repairing shop....insert another simcard and see.Secondly,check the sim card connector.If the problem remains the same visit nearest mobile repairing shop,the problem comes from the internal problem.To fix this you need to change the sim IC(Filter).Thanks for visiting fixya
The Simcard might gone bad due to some reason, try this sim to other phone, if it not works then issue another sim to your service provider.
otherwise the contact at phone may gone bad, needs repair.
sir/ma'am, in some other phone offline means insert sim, so u have to try to put the simcard properly then test, if the problem still, it is need to repair go to service repair center to fix the phone,
sir the only solution to this problem is take it to a repair shop & have the firmware flashed with a higher version if this doesnt solve the problem have the sim IC replaced if it doesnt solve then the issue is serious TAVHO IC needs to be changed.