Vodafone — Outgoing and incoming calls

Even though the network coverage is not bad, I can't place any call and incoming calls are also disabled. When I place call it shows dialing, not in coverage area, can't place call because mobile number not registered.
This happens randomly and on other days calling works fine.
I have tried inserting SIM again, airplane mode, turning off other em devices. But nothing works.
I have Vodafone sim card.