Personal Phones
Many people in my campus use cell-phones to communicate, not only with relatives and friends at home, but also with others within the campus. When a call is made to another cell, it has to go to through a service provider even if the callee is close-by, and therefore the caller is charged.
If calls could be made to other cell-phones directly whenever the call-recipient is within a critical radius, it would save a good of resources, and also reduce the load on the telecommunication infrastructure.
However, I think a cell-phone powerful enough for this purpose would probably violate Government norms.
