My iphone 4s is updated to ios7.1 after that it shutsown when i insert the sim.if ther is no sim it was working properly.what can i do for this

Hi Ravihara,
Thanks for visiting Apple Support Communities.
If your iPhone is not working with a SIM card inserted, I recommend these troubleshooting steps:
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.
If you still are unable to resolve this issue, contact Apple support for further assistance.
From:
iPhone: Troubleshooting No SIM
http://support.apple.com/kb/ts4148
Best Regards,
Jeremy

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