I upgraded ma 3gs to ios5 in i tunes it asks to inset sim which is already done.how to fix this problem?

after upgrading 3gs to ios5. itunes shows dat no sim inserted which is inserted ,n the ph have no cellular service.how do i  fix it?

Have you tried right clicking on your iPhone within iTune and selecting restore from backup? If there are any available, it will take you back to prior iOS5 update.

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