I bought an iphone 3g 8gb that was already jailbroken using spirit. The baseband is 05.12.01 and the software is 3.1.2. I woukd like to sinc it with my itunes. Do i need to jailbreak it again. If yes what should i do. Will the phone be locked after the process? If yes what should i do.
I want to tether it with my mac . What should i do?

Any help will be greatly appreciated. Thank you!