Um, Wi-Fi + Cellular plan means you can use it anywhere with the phone company's data as well as anywhere that Wi-Fi is accessible. A Wi-Fi only means you can only use it Wi-Fi is accessible like your home, McDonald's, Starbucks, etcetera. Yea, you can get a data plan with any iPad I believe. The benefits of a cellular plan are being able to use internet access anywhere at any time, since you can't with just a WI-FI enabled one.