Network problem when update ios 5.1.1

hi,
I am in big problem with my iphone 4, when upgrade in ios 5.1.1 then my operator's network some times showing and sometimes not showing. Also notice that if the network bars is full but it is not working.
Please help me with some advise at   [email protected] . 

Reset network settings and see if it solves the issue.
SETTINGS - GENERAL - RESET - RESET NETWORK SETTINGS
If it doesn't, try basic troubleshooting steps in order.
1) Turn your phone OFF and ON again.
2)  Perform phone reset.
3)  Restore from a backup.
4)  Restore and setup as new.

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