That's a super useful proxy! I'm very much interested in WiGLE's growth-over-time curves for all RF bands. Even if the sampling is relative and incomplete, it's extremely informative. WiGLE seems to be the only resource offering useful data – not to mention transparency – on an otherwise secretive to ...

On the homepage, there's the excellent "Statistics Over Time", which shows a graph of # of WIFI networks between 2002 and 2020.
Is there a similar graph for cell towers, showing # of towers over those years? Or some way to find out how many towers there were in the world in 2002?

Thanks!