A cellular telephone system can provide connection to the PSTN for any user location within the radio range of the system. Cellular systems accommodate large number of users over a large geographic area, within a limited frequency spectrum. Cellular radio systems provide high quality service that is often comparable to the landline service. High capacity is achieved by limiting the coverage of each base station transmitter to a small geographic location called cell so that the same radio frequency can be reused by another base station located at some other distance. A sophisticated switching technique called hand off enables a call to proceed uninterrupted when the user from one cell to another.
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