Hmm, where are Turks island?

That must be a remote place!
Yeah this unlocking stuff can be complicated sometimes especially if you dont have someone local to give you a hand. On the other side there is another style (hardware)unlock solution which would maybe be easier for you. I bought my unlock sim card from
Unlock iPhone 3G - Instant Unlock any iPhone
Its sim card that you insert into your iPhone and it fools your iPhone to behave like it is connected to the TT network. Works quite nice for me. Hope this helps.