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Roaming refers to a wireless network service extension in an area that differs from the registered home network location. Roaming enables a mobile device to access the Internet and other mobile services when out of its normal coverage area. It also gives a mobile device the ability to move from one access point to another.
Roaming is derived from real-time optimally adapting mesh (ROAM).
Roaming services are usually provided by cellular service providers as well as Internet service providers (ISP) via a cooperative agreement. Traditional cellular roaming services are provided by both the Global System for Mobile Communications (GSM) and code division multiple access (CDMA) operators. Services are either free or billed according to local area rates. Wireless telecommunication roaming services are usually included in mobile/cellphone subscriber service packages for use outside local networking zones.
GSM/WLAN roaming services can be supplied in two different scenarios. One is SIM-based roaming and the second is username/password base roaming.
Wireless local area network (WLAN) roaming services are segmented as follows:
An ISP uses special software to automatically track roaming usage and corresponding billing. To benefit from roaming, subscribers should have an ISP connection that supports roaming. A traveling user may route calls to the ISP's locally assigned number after logging into a foreign ISP through a computer modem. The foreign ISP provides Internet access after validating the user's home mail server.