So me and my sister are on a FAN family plan and we both want to upgrade to the iphone 4. Shes getting a full discount and im only getting an early upgrade discount since i got the 3GS last year. Is it true that I am only allowed one pre order per household from ATT.com? and if so, how can i pre order the other one? can i pre order from apple and still keep my same voice, messaging, and data plan?