Can someone give me a quick review (what devises it support and firmwares ect.......) about iCloud please :D ? i have iPhone 3g v.4.2.1, will it support my devise ?

Hey Bro, What's Up ? .My family and I had car accident and im at home for few days and have $15 in iphone account, hoping to make the most out of it :) and I wish this is a active site :D . just one question whats the ranks in this forums or do you guys just have members and mods only ?