I am currently on a 3GS and to save my battery life, I stay on Edge primarily. If there are more urgent needs, I tend to switch to 3G for faster data speeds of course. Now I was curious, I am currently still grandfathered into the unlimited data plan but it does not seem like I need it. I am planning to get the iPhone 4 or 5 (pending release of 5) and was curious on how much data increase should I see if I use my new iPhone and stick it onto 3G network all the time. Would there be a huge increase in data because currently I only use like 300MB tops? I do not plan to tether since I usually don't take my MBP if there is no WiFi and never did I think "man, I wish I could tether". Thanks guys!