Thats not true!! The Birdstep Mobile IP Client roams between various types of nets: 3G, Edge, Bluetooth, GRPS/GSM and so on. This is from Birdstep`s own homepage:
Seamless handover Birdstep Intelligent Mobile IP provides seamless handover with no user intervention between infrastructures such as LAN, WLANs and cellular networks, thus integrating two different radio technologies. The PPP dial-up support includes technologies such as PSTN/ISDN, GSM/ GPRS, CDMA2000, PPPoE software used for ADSL connections, and also Bluetooth. The solution is only dependent on terminal support for the necessary network interfaces.
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