Hello, I'm planning on unlocking my current iPhone 3GS 32 GB and selling it when I buy my iPhone 4 on launch day. If my current phone isn't jailbroken or unlocked or anything right now (runs iOS 4) then will it lock up when I activate my new iPhone 4, keeping it from being able to jailbreak? In other words, do I need to do the unlocking and everything before I buy my iPhone 4?