I've 32GB 3GS iPhone. (3.1.2)
I've jailbreaked it via blackra1n (Cydia and sn0w).
I had a few problems, but i managed to solve them with help of a guy from a local forum.
I'm left with three problems currently.
1. I can't transfer video's to my itunes, it shows up like this ..
restore and jailbreaK again. easiest way to solve most problems, although every time i jailbreak my voice recorder stops working but i just poofed it and i was happy lol