I am using my friends iPhone for few days because he has went for a long vacation to India. Everything was working fine but from few days the phone doesn't ring up and when i am trying to make any calls, over here i am not able to hear any dial tone and after some time it says that call failed and at the same time i am also not aware for incoming calls too. Can anyone tell me what would be the exact issue or tell me why i am not able to make or receive calls from iPhone
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