With the video calling being Wi-Fi only, is anybody considering dropping down their data plan and saving the $5 or $15 a month? I think I will be considering I'm not much of a data hog now anyways... and when I get the iPhone 4 I don't necessarily see my data going up any more. Unless, can anybody tell me what may happen in the next year or two of my contract that I'll have wished I kept the unlimited data?