I've had the iPad 16gb for about a day now and the 16gb seems perfect for me. I am considering, though, returning it and getting the 16gb 4g Verizon version. I already have an iPhone 4S with unlimited data. My question is though, do I have to get a separate $30 data plan for the iPad? Will I still have unlimited? Is there a way I can just switch the data between my phone and iPad?