So, TurboSIM is nice cuz it's programmable, blah blah blah, I couldn't figure it out, and I'm hearing about yessim needing programming too. I took the risk with this SIM from ebay.
UNLOCK SIM CARD for ::::: APPLE 3G iPHONE :::::::::::: - eBay (item 380049010739 end time Jul-25-08 21:07:18 PDT)
It worked. Easy. Used a hole punch for my SIM and it was working right away with no software modification. Went to settings, turned off 3G, put internet2.voicestream.com (T-Mobile USA) in the APN, and I was good to go. I did have the classic problem a couple days ago having to switch out the SIM to another phone to reactivate it, but I'm pretty sure that's gonna be an inevitable hardware problem until they (IF they) figure out a software unlock.
But in the meantime, if you want a cheap and easy 3G unlock, go with this one! Any questions? Good luck