TS4268 I updated my iPhone 4s to version 6.1 and can't make or receive any more calls. What can I do?

Hi,
As stated, I updated my iPhone 4s to version 6.1 and can't make any calls now.
Restoring it to a prior state doesn't rollback the iOS version, so I'm stuck with a brick now.
Does anyone have a solution to this?
Thank you.

Well, frankly you've provided no useful details.
If you want help, we need details.
Any errors on the device?
Is it activated?
Is it saying "No Service"?
Unsupported SIM?
Have you tried removing and reinstalling the SIM?
Replacing the SIM?

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