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Seamless roaming for GSM / WLAN / Bluetooth

Following articles on Slashdot and Heise, the new standard UMA (Unlicensed Mobile Access) will allow seamless roaming between the wireless standards GSM, WLAN (WiFi) and Bluetooth.

This is a huge benefit, in my eyes and a huge shot against UMTS (which is IMHO really senseless in times of WiFi). A new generation of mobile devices can make heavy usage of UMA. I imagine a mobile device, which uses GSM by default (since it's mostly everywhere available), switches to Bluetooth / WiFi at your home, to connect you through your local phone device, or to the WiFi of a public hotspot, if available, to communicate e.g. by VoIP.

A nice dream...

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