Ok. Preorder completed. Fully paid X T-mobile version should be delivered on Nov 3. Now it's time to worry about next step. I'm not using Tmobile, so is there any specific step to activate X? I assume before turn on the X, I can just take out the Tmobile SIM card, pop in mine, and turn on X and enjoy. Or do I need to connect to iTunes or some other step? Does turn it on with Tmobile SIM card prevent me from using another carrier? Thanks.