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Fundamentals of Mobile and Pervasive Computing by Loren Schwiebert, Golden Richard III, Sandeep Gupta, Frank Adelstein

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Chapter 2Mobility Management

In modern times, people are much more mobile—relocate more often—than in olden days, yet we are expected to be always reachable. The average American family moves once every four to five years. In addition, most of us have many credit cards in our wallets. To ensure that we continue to receive our bills on time (and other letters, such as junk mail), we do the following: (1) we inform the post office of our new address, and (2) we inform the credit card companies of our new address. The post office forwards letters arriving at the old address to our new address for a period of one year (only 60 days for periodicals), so any credit card bills sent to you before you inform the credit card company of your new address ...

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