Unlimited Data for a cellphone is much different then unlimited data for a computer. Cellphones Often Use mobile websites that are scaled down in size to reduce the data use. Computers eat data like no other that one song you download is prolly two days worth of moderate internet use on a cellphone. Of course this all depends on the cellphone you have and your habits. The Cellphone companies Most likely predict that with most peoples Computer based internet habits they would more then overdo the predicted use Threw cellphones. Its all Thought out in great depth before they create new plans of any sort. They need Cash back per kilobyte you use and thats their main goal.