At each college, the students who choose to get an iPhone must pay for mobile phone service. Those service contracts include unlimited data use. Both the iPhones and the iPod Touch devices can connect to the Internet through campus wireless networks. With the iPhone, those networks may provide faster connections and longer battery life than ATTs data network. Many cell phones allow users to surf the Web, but only some newer ones are capable of wireless connection to the local area computer network.

　　University officials say that they have no plans to track their students . They say that they are drawn to the prospect of learning applications outside the classroom, though such lesson plans have yet to surface.

　　My colleagues and I are studying something called augmented reality , said Christopher Dede, professor in learning technologies at Harvard University. Alien Contact, for example, is an exer cise developed for middle-school students who use hand-held devices that can determine their location. As they walk around a playground or other area, text, video or audio pops up at various points to help them try to figure out why aliens were in the schoolyard.

　　You can imagine similar kinds of interactive activities along historical lines, like following the Freedom Trail in Boston, Professor Dede said. Its important that we do research, so that we know how well something like this works.

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