While in suburb areas, each cell tower covers a wider area, so the result is less accurate.
This Cell Tower Locator sends query to Google location server, and returns the location.
Members can also block people they have no further interest in.
Ever since inception, more than six years back, the site is free for non-commercial usage.
The mobile number database with owner details is updated twice monthly.
So the density of cell towers will determine the accuracy.
Generally, the density is higher in the urban areas especially at downtown.