I can’t receive call or make call in my phone and also write the cellular update failed what do !

Hi D.B.C,

Thanks for reaching out in Apple Support Communities. I understand you're seeing an alert on your iPhone of "Cellular Update Failed." I can help point you in the right direction.

I recommend following the steps outlined in this helpful article: If you see an Update Failed or Apple Pay Not Available alert after iOS update or restart Following these steps can help resolve the issue you're experiencing.

Best regards.