How to unlock iPhone 4 4.2.1 03.10.01?

We'll I I used to have an iPhone 4 on AT&T but the phone bills were too expensive so I canceled and got a Tmobile phone Which broke about a week ago and now I don't have any money to get a new phone and I don't want to sell the iPhone and I've also heard that ultrasn0w 1.3 can unlock 03.10.01 baseband but I don't know were to download the windows version cuz I found the one for mac and I don't have a mac so Please Help… Thanks IN ADNVANCE

I'm not sure if you want to spend like some money but this was how I got my iPhone jailbroken.

Just signed up with http://iphoneunlockshop.com and they send me everything that was needed so I could jailbreak my phone. Not sure if this is the same with you but it worked well with what I needed.

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