Problem activating iphone 4 after upgrading to iOS 5

I have purchased an iphone 4 which is factory unlocked in Malaysia. I upgraded the phone to IOS 5 from the US Store since I live in USA and frequently travel to Asia. After upgrading the phone it worked with both a Malaysian Sim Card and a Thai Sim Card. I then purchased an iphone 4S and am able to use it everywhere as it is also unlocked. When I erased the iphone 4 and reset it, it will not let me activate the phone with either the original sim card or any other sim cards. Why? How do I correct this problem?

Did you check your security software settings? eliminating conflicts from third-party security software.

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