You need to have both enabled in order for any logging to occur. Let's explore the 4 scenarios: Cell Off, GPS Off: Nothing to log. Cell On, GPS Off: Phone kn

You need to have both enabled in order for any logging to occur. Let's explore the 4 scenarios: Cell Off, GPS Off: Nothing to log. Cell On, GPS Off: Phone knows what towers it can see, but can't set the location. Cell Off, GPS On: Phone knows where it is, but can't see towers. Cell On, GPS On: Phone can see towers, and knows location. Logs this data.