• Bearer Mobility: User should be able to move from one bearer to another and use the same service. Example could be a user was using a service through WAP bearer in his home network in Bangalore. He moves to Coimbatore, where WAP is not supported, he switch over to voice or SMS (Short Message Service) bearer to access the same application.
• Device Mobility: User should be able to move from one device to another and use the same service. Example could be sales representatives using their desktop computer in home office. During the day while they are on the street they would like to use their Palmtop to access the application. • Session Mobility: A user session should be able to move from one user-agent environment to another. Example could be a user was using his service through a CDMA (Code Division Multiple Access) 1X network. The user entered into the basement to park the car and got disconnected from his CDMA network. User goes to home office and starts using the desktop. The unfinished session in the CDMA device moves from the mobile device to the desktop computer. • Service Mobility: User should be able to move from one service to another. Example could be a user is writing a mail. To complete the mail user needs to refer to some other information. In a desktop PC, user simply opens another serv-ice (browser) and moves between them using the task bar. User should be able to switch amongst services in small footprint wireless devices like in the desktop.