My iPhone 4 Locked by itself

I had an iPhone 4 with an IOS 4.3.1 firmware updates; I restore it to its original factory setting (not for the first time), send it to my friend as a gift and bought a new one and use it... the second day my friend send it back and informed me that it has a problem, I put back my SIM connect to iTunes and then i got the following message : " The SIM card inserted in this iPhone does not appear to be supported"  in the beginning i thought maybe i have re insert the SIM again and turn OFF/ON the iphone again, but I was always getting this message.... Took the same SIM card and put it in the new iPhone and it works fine, although it was always for the past 6 months using the same SIM card with the used iPhone 4... I need help please how to fix it back, also i think that maybe my friend has updated this iphone 4 using the back up of his old 3GS iPhone (Jail brake and unlocked phone), please bear in mind that the iPhone 4 was not locked and jail brake or whatever; it was factory unlock... Awaiting ay reply that can be helpful to my iPhone 4... Thanks in advance.
Fariz

iPhone4 is feeling jealous of Siri and showing you that it can AI too.
Does this happen if you force quit the iPod app in the multitasking bar?

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