I work outside the USA. I purchased an IPhone 3GS unlocked from a local dealer. On a trip back to the States I left my phone behind and my house-sitter deceided to "do me a favor" and update my phone before he sent it back to me (we have sucky Internet here). Somehow he overwrote my legal unlocked IOS with the US ATT locked IOS. Is there legal unlocked IOSes available to be restored to my 3GS? I bought the phone in Thailand. Thanks.