My iphone 2g was unlocked in a shop and then i upgraded the software on itunes to 3. 1. 2. I then tried to jailbreak my phone by using blackra1n and unlock it with another application beginig with C and another “boot” something. . . but once it had been completed it still didnt allow me to change the sim card and asked me to connect it to itunes.

Can someone who is a geek pro at this please help me out?

Thanks