Blackberry Storm unlock?

I have blackberry storm and I used it with vodafone whn i was in europe.. Some people tell me that it's unlocked. When I put at&t chip in it; it says SOS right by the signal bar. In network option where you change the global to GSM and 3g networks it says AT&T in front of Mobile Network. I want to know if its unlocked or not if not what i have to do to get it unlocked so i can use it in united states. I called the verizon wireless they said its already unlocked because its with vodafone but how come its not working with AT&T thn.. hmm any help?

You can simply visit the mobile-unlocker.com which supports all the blackberry models. You can unlock your blackberry storm without any hesitation because I had just unlocked my blackberry phone from them and I am so happy to avail their services.