Sony Ericsson’s card supports three GSM bands, GPRS Class 10, and 802.11b, and will allow roaming when more of the backend components are built. This card would allow a carrier to bill using EAP SIM, which encapsulates messages over the GSM network to allow Wi-Fi network authentication using the SIM authentication module. I’m unclear whether this will use simple MAC address clearance — your MAC address sent over GSM and then the hot spot unlocking access for that address — or something more sophisticated. If just MAC address unlocking, it’s easy for someone with a sniffer to clone your address. According to IETF presentations a few months ago, all of the EAP-plus-method flavors lack cryptographic binding between network layers, which allows address spoofing, but not necessarily network access.
So when can i get my 802.11a/b/g/etc, Bluetooth, GPRS/CMDA/GSM/everything else card? I’ll take two. This is really cool tech though.