I have an iPhone 4. from AT&T. I jailbroke it using limerain. and from the cidya app I used ultrasnow 1.2 from repo666.ultrasnow.com to unlock the phone. At first. The phone didn't get any signal until I put the phone on airplane mode and turn it back to regular mode, then the signal was good. So I'm wondering if with this ultrasnow app download I'll be able to use any gsm carrier in the world ? The phone is on the version 4.1. Modem firmware 02.10.04. *I also notice that on the general settings of the phone it shows "carrier" with an arrow. And when I push it shows a screen n it says "automatic". With a check mark. that wasn't there before. Can anyone help me out ? Thanks!