This article gives an overview of the evolution in the mobile communications world. The uptake of 2G technologies has been tremendous, even though several systems exist that are not interoperable. 3G will bring some convergence, but will not achieve the goal of a single global technology. At the network level, IP is becoming more important. In hot spot environments, WLAN is bringing a complementary technology toward cellular.
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Vriendt et al. (2002) studied this question.
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