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Invalid SIM on iPhone 3GS

unbubblelivable

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I restored and updated my iPhone 3GS to iOS 5 and I receive the "invalid SIM card" error. I replaced the SIM card and AT&T ensured me that wasn't the issue. I haven't jailbroken my phone, but I hear that may be the only solution? I'm stuck at the "invalid SIM card" screen though can go back to the "Restore" screen, but those are my only 2 options. Therefore, I'm unable to find out what the firmware is or any other details. Please be very descriptive with the steps for possible solutions!
Thank you in advance!
 
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unbubblelivable

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I've tried 2 different SIM cards though and that didn't fix it. Would unlocking/jailbreaking fix it? If so, how would I go about doing that?
 

Jmills87

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No, if its an official SIM and it's not working on a factory firmware, it's definitely not going to work on a jailbroken firmware. There's no need to unlock if you have an official carrier.
 

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