iPhone 2G and unlimited data | Phone/Device Issues and Features | Consumer forum

Hey guys, I bought a jailbroken and unlocked 2G iphone about a month back. It is on software version 3.0. I want to take it to 3.1 but am worried about screwing something up, as everything is working perfectly. My question is, are any of you using a 2G iPhone on 3.1.1 or 3.1.2, and is your unlimited data working okay? Also, what method did you use to jailbreak and unlock your phone. I really have no idea what method the previous owner used, so I something doesn't work, I won't be able to go back.