Add
http://repo.bingner.com as a repo in Cydia
make sure it is not connected to the PC
go into your main SAM setting. then turn off (hacktivate option) then go into the "more" ult. and choose the "de activate iphone" then choose the "deactivate iphone (clear Push)". go back to the main SAM settings menu and choose the "more information" it should say that the iphone is unactivated. connect the iphone into the computer.
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You can jailbreak with redsn0w. but you wont be able to unlock the iphone through ultrasnow. unless you saved the shsh blob of you iphone 3GS, restore it back to 5.0.1 and download the ultrasn0w. or if you have iphone 4, there's no way to unlock it because you baseband is too high (only way is through AT&T).
SAM is NOT a sim card. its an app/software on iphone that can be downloaded on jailbroken iphones.