I'm surprised this police tactics are still now widely known outside of Germany. But seeing the included GPS chips in smartphones & tablets makes me believe that this is even easier & more precise these days for other "institutions" and Online-Targeting companies without publishing this.

But maybe there is also hope with smartphones, you could start effective "Gegenmaßnahmen" (counter-measures) by routing your calls via vpn,voip and anonymous throw-away calling cards - to cover at least your location. But don't forget to disable the "location based serives" and install an outbound firewall then ;-)