Well as I said before the iPhone 4 was completely different when it comes to unlocks ... Added security means more waiting for t mobile users or other iPhone friendly networks Wich any unlocker hopes to use ....bottom line is if you have t mobile and plan on using this line don't update to an iPhone 4 yet. (unless you want a really expensive iPod lol) personally I'm enjoying my unlocked 3gs on t mobile and plan to upgradeto the iPhone 4 after the mayhem is over and the devs have it all figured out