If for some reason you need to unlock you Blackberry Storm and use it on a GSM network instead of Verizon’s CDMA, here’s a video showing you how to do it. Of course, the video will point you to a site where you can pay for an unlock code. OR you can also call up Verizon and ask them for the unlock code! (It might take a bit longer but it’s free that way.)
Unlocking for Sprint Blackberry and other recent Blackberries should be similar.