Are there any precautions I should take when activating an iphone4 in order to not lose my FAN discount? For example, I was told not to buy it at apple, so I purchased it through AT&T, instead. How about when I activate it? Do I have to call in or can I do it online? Any other strategies? I'd strongly prefer to not need to add the FAN again. It would be *much* easier to just not lose it in the first place.