WiFi vs Cellular

Some argue that Wi-Fi and related consumer technologies will replace cellular telephone networks such as 3G and GSM. The current generation of Wi-Fi is still lacking roaming and authentication features (see 802.1x , SIM cards and RADIUS) and the limited range of Wi-Fi as well as the narrowness of the available spectrum are holding back its proliferation as 3G replacement.

However, the bandwith and overall capabilities of Wi-Fi are already exceeding those once promised by 3G cellular telephone standards which lead to the use of the term 4G being used for Wi-Fi. Companies like Zyxel, SocketIP and Symbol Technologies are already offering telephony platforms ( Central Office replacements and terminals (phones)) that use Wi-Fi VoIP. Many vendors are now selling mobile Internet products that link Wi-Fi and cellular radio system in a more or less transparent way to take advantage of the benefits of both systems. Future wireless systems are expected to routinely switch between a variety of radio systems.

Cellular

Cellular

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