I had already update mi new factory unlocked iPhone 4S to iOS 5.1.1 and I still having problems with "invalid sim". I'm from Argentina and here we don't have official service. PLEASE HELP ME, WHAT CAN I DO??? In Argentina is too expensive an iPhone 4S.

I had already update mi new factory unlocked iPhone 4S to iOS 5.1.1 and I still having problems with "invalid sim". I'm from Argentina and here we don't have official service. PLEASE HELP ME, WHAT CAN I DO??? In Argentina is too expensive an iPhone 4S. Please I need help to continue believing in Apple. Thanks a lot. If anybody speak spanish better.  

Was it purchased from an official Apple Store, not a reseller?  Only Apple Stores sell official factory unlocked phones.  The others sell hacked to unlock phones, and the unlocking is unstable.
Try these steps, as needed:
1. Reset phone - press both home and on/off buttons for at least 10 seconds until the Apple logo appears.
2. Settings > General > Reset > Reset Network Settings.
3. Replace SIM card (and reset network settings again)
4. Restore Phone in iTunes using a backup
5. Restore in iTunes as new, without using a backup

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