Elliot Soloway, an electrical-engineering and computer-science professor at the University of Michigan, in Ann Arbor, and the founder of the Center for Highly Interactive Computing in Education, insists the differences go a bit further. The ability to access the Internet through a device whose cost is a fraction of that of a laptop, he says, potentially gives students rich and poor the “unprecedented” ability to answer their own questions. Moreover, he argues, trusting a student to use a cellphone properly creates more-responsible students.