

I picked one of these up around 2015 and used it as my main phone for ~2 years. It’s a cool phone and I had a great time messing around with it.
Unfortunately the hardware is just into up to modern requirements - old modem means bad signal, old WiFi standard, really low RAM, very slow processor. The browser was barely usable even with an adblocker.
Sadly the Neo900 never got off the ground.
I agree although presumably when you add more devices and types of signal you can build a much richer picture without 3 access points.
For example, in my living room I have a cordless landline, Bluetooth soundbar speaker, WiFi access point, a fixed media box that uses WiFi. Presumably you could build a picture from the interference patterns of these different types of device, which are all on similar frequencies (2.4GHz ish).