Hey fellas, So I activated my iPhone 4S today (after hours of trouble with AT&T...) and I was curious. Does my iPhone 4 become like unlocked? Like I could theoretically take it and activate it with Verizon, or go abroad and get a SIM card there? Been wondering that. Because if I sell my iPhone then I'd have to buy one back for a lot of money. Don't want to do that if I have an unlocked one... Thanks!