My iphone 3G wont allow my sim card to work

After my son tried to install a softwhere upgrade on my iPhone 3G the phone will not accept my sim card. I have reset to factory settings but it still does'nt work.
Any suggestions?

Was the phone hacked to unlock it prior to the software update...I.E.-not officially unlocked? Sounds like it was. Updating software or restoring a hacked iPhone will re-lock it to the carrier it was originally locked to. Seems that's what has happened to you. You have two choices: 1. Get the phone officially unlocked, or 2. Re-hack it.

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