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|“||[t]he ability to use a single communications device, such as a mobile phone, across different cells or access points without losing the network connection.||”|
|“||the use of a wireless phone outside of the "home" service area defined by a service provider. Higher per-minute rates may be charged for calls made or received while roaming. Long distance rates and a daily access fee may also apply.||”|
Roaming requires that the home and visited systems be able to exchange messages about the roamers. Before it allows a roamer to make a call, the visited system checks with the roamer’s home system to determine if they are a valid user or a fraud risk. The visited system also tells the roamer’s home system where its customer is located. The home system is then able to forward any incoming calls to the visited system, allowing users to receive calls wherever they are located. To exchange messages about roamers, the cellular industry has set up roaming networks using leased lines and special computer communications systems.