Here's one for the VS guru's. If I get a 4g phone from Ebay, swappa, list, etc., will I be able to use the sim card out of my D3 or D2G to activate it? I've been looking at upgrading phones(though, not through VZW(still grandfathered)) and I just found out about the sim card for 4g phones. If I can't use my D3 or D2G sim, is there a way to get a sim without going through VZW? I really don't want to lose my UL data?