Question: what is the difference between a tablet with wifi and 3g?
Answer: 3G is kind of like “Wi-Fi everywhere,” meaning it provides Internet access via the same radio towers that provide voice service to your mobile phone. (FYI, 4G is the same thing, just faster.) Ah, but not all devices are equipped to access 3G service. The Kindle Fire and Nook Color, for example, are Wi-Fi-only tablets.