After reading Droid-Life's post on using Google Gesture Search to find the "hidden" 4G settings menu on the DInc, I followed suit on my DX, and found a settings menu to unlock a SIM card. Having only been on Verizon, I'm not all that familiar with SIM cards, but would this be used to unlock the phone from carrier restrictions, or is this just an artifact setting used only on GSM Android phones? I'm mostly curious, since I can't seem to find any postings related to the Droid X.