Had an interesting meeting with Seeker Wireless this morning. Don’t have time to go into too many details, but they’ve basically come up with a clever way of helping operators do homezone-style pricing – without the complexities of UMA/SIP WiFi or femtocells, or the often-poor granularity of Cell-ID based systems.
Long story short, Seeker uses some clever software on the handset SIM which watches different base stations’ signal strengths, plus a location server, to work out where a given phone is compared to a pre-registered home address, then feeds it back to the billing system.
Obviously, this doesn’t give the improved indoor coverage/capacity or user-paid backhaul benefits of the WiFi or femto approaches, but it sounds a lot easier, and should work with any 2G or 3G handset without modification, as the software's on the SIM and not sitting on top of the OS.
(apparently it's not behind the KPN service announced the other day, though, which seems to be regular cell-ID after all)