User mobility

In user mobility ,the user who has to access to the same telecommunication services at different places .Users are considered as mobile and services also follows .The best example may be call forwarding .

Cellular systems

In present and future the computers are portable .But the users need to access the networks .To do this the only choice is wireless .People will also be mobile .

There are two kinds of mobility :
1.User mobility
2.Device portability