Why cant i make or recieve calls?

I just got a new phone, got it all set up and even made a “test call”. Everything was working fine. But once I left the WiFi zone, my phone stopped making calls and no one can call in… Did I miss something while setting up or is there something I can do to fix this?! (Texts and being sent and received fine)

A good bet would be to review the document Make and Receive a Phone Call

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