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Hello Rastaboybi,

To help us better assist you, can you let us know more about the issue you're experiencing? For example, do you receive an error message when trying to place a call? If so, what does the error say? That information will help us plan how to proceed.

Please check out the information in this link, which outlines what to do if you can't make or receive calls on your iPhone, and may help: If you can't make or receive calls on your iPhone

"Contact your carrier

When you contact your carrier, make sure that:

• Your account is set up to use your iPhone.
• There aren't any localized service outages.
• Your account doesn't have a billing-related block.
• Your calls don't have errors on the carrier system."

You can also manage the VoLTE settings on your device by using the process outlined here, which may help: View or change cellular data settings on iPhone

Thanks!