My phone says SIM not valid after ios 5 update, Why and how do I fix it?

Why does my iPhone 4 say SIM not valid after I updated to ios 5? Also, is there anything I can do to fix it?

Sounds like your phone was software unlocked, or hacked/jailbroken, to work with any carrier. Updating the phone restored the original carrier lock. All you can do now is contact the carrier it is locked to and see if they have an unlocking policy.
Good luck.

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    tanzim                                                                                  
    If your query is resolved then please click on “Accept as Solution”
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