Hi,Addictionn
I don't have that much Idea about jail breaking,but I think I can help you to unlock your Iphone 3gs.If you are interested then I would suggest you to use the remote unlock service which is said to be the best and reliable way to unlock a Iphone at low cost.You can get the remote unlock service from the site
You must login or register to view this content. by providing some basic information about the phone like the country and the network to which the phone is locked to.By providing this information you can avail the service to unlock your phone to use it with any other GSM network of your choice.