Hello. I updated my iPhone 4S to ios 7.1.1. And now it shows "no SIM card". This never happened before. How can I downgrade?

Hello. I updated my iPhone 4S to ios 7.1.1. And now it shows "no SIM card". This never happened before. How can I downgrade?

Hey User13579,
Thanks for using Apple Support Communities.
Follow these steps to attempt to resolve the issue.
iPhone: Troubleshooting No SIM
http://support.apple.com/kb/TS4148
Toggle Airplane mode On and Off.
Try turning iPhone off and then on again.
Check for a carrier settings update. Tap Settings > General > About. If an update is available, a prompt will appear.
Remove the SIM Card and verify that it is a valid, carrier-manufactured SIM. Also verify that it is not damaged, worn, or modified. Then reinsert it.
Restore the iPhone.
Have a nice day,
Mario

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