I bought a factory unlocked iphone 4s. it was working fine but when i upgraded it to iOS 5.1 it gave me "no sim" message. so when i tried to restore the iphone setting it is giving me now "ICCID: unknown" message please help. any ideas?

i bought a factory unlocked iphone 4s. it was working fine but when i upgraded it to iOS 5.1 it gave me "no sim" message.
so i tried then to restore the iphone using itunes but it got worse it is giving me now "ICCID: unknown" message please help. any ideas?

Please define "factory unlocked". The term is basically meaningless. iPhones are sold either carrier locked or unlocked. Some carriers will unlock them after a period of time upon meeting certain requirements and paying a fee.
There are lots of places that will "factory unlock" an iPhone. This basically translates to "hack". This can cause permanent damage to the phone. Best case scenario is these phones will re-lock to the original carrier on an update or restore. Worst case it they become expensive bricks.
ICCID unknown indicates a critical failure. There is no way to resolve this other than taking it in to Apple and getting the phone replaced. It's very possible that the phone was hacked and attempting to update has now killed it.
Where, EXACTLY, did you get this phone?

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