I'm buying a used Droid Razr 4g and currently have a Droid Pro. Can I take the sim card out of my pro and put it in the Razr and will it work? I'm trying to avoid going to Verizon. I want to be able to use the new phone tonight, I'm excited. I'm due for an upgrade in 6 weeks, but aren't going to use it, because first of all I cracked the screen on my Pro last week, and secondly, I have the unlimited data plan and don't want to lose that. Thanks for any help!