I just bought an iPhone 32GB 3GS on 4.0 recently. It's not unlocked or jailbroken. I currently have a 16GB 3G on T-Mobile and it's so slow. Can someone tell me step by step what do I have to do to get that 3GS 4.0 to get it on T-Mobile? Can I directly go to http://jailbreakme.com and jailbreak it from there then download an unlock?