I can’t make it receive calls

If this is a new phone then ensure that you have a valid and active SIM card in your iPhone. You may be able to transfer the SIM card from your old phone to your new iPhone.

Also, The information that you are looking for exists in this article that you were reviewing earlier 👉 If you can't make or receive calls on your iPhone

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What did your carrier say when you contacted them with this issue?

Axel F.