Tracking is separate from recorded and forwarded history of travel. It has always been possible to hire an agent to follow a specific indivdual. This is different from carrying a device which tracks everybody by default at a very low cost.
An external agent to track dumb cellphones is far more complex than having an agent running inside a smart phone. It involves pretty substantial external resources and doesn't easily scale to large populations.
You knew this, I hope, and were just trolling us. Right?