I have my iPhone 4 with the unlimited plan and will never give it up, but also have an iPad with the unlimited SIM. I don't carry the iPad everywhere I go, but damn do I do a lot of streaming of Netflix and music when I have it. I thought about jailbreaking once a untethered jailbreak is available and using MyWi, but I also don't want to be a guy sucking 10-15GB of data a month on my Iphone and AT&T fining me or something. Is having both overkill? I am paying $60/month for data between both devices.