Why my device unable to receive incoming calls?

1) Make sure your phone is switched on and connected to a network (check if the network is overloaded or unavailable).
2) Check your subscription status with your operator (credit, SIM card valid, etc.).
3) Make sure you have not forwarded incoming calls.
4) Make sure that you have not barred certain calls.
5) Make sure that your phone is not in flight mode.

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