Roaming is a service that allows a subscriber of one operator to use the services of another operator when inside the latter's coverage area. Over 20000 roaming agreements have made the GSM service available around the world; the same is expected also for GPRS, and further for 3G. Operators are now implementing GPRS roaming using so called "home network" model where traffic from visited network is routed back to home network using GRX networks. This paper provides an insight into the end-to-end roaming models in the mobile communications industry and identifies the possible roaming business model scenarios for GPRS and beyond.
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