I Received a message say I have cellular issues and can’t make or receive phone calls

Please contact your Carrier and understand the cellular plan that has come with the SIM.

There is nothing that needs to be done on the iPhone for sending SMS and making voice calls.

1. If you can't send or receive messages on your iPhone, iPad, or ...
2. If you can't make or receive calls on your iPhone - Apple Support

Airianna3 Said:

"I Received a message say I have cellular issues and can’t make or receive phone calls: Why is my phone saying I have cellular issues and can’t make no calls"

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Did you recently install an update?

Refer to the link provided atop this post.