How to Triangulate a Cell Phone

How to Triangulate a Cell Phone

An overview of the evolution of mobile phones and a guide on how to use signal towers and basic geometry to triangulate a cell phone's location.

Mobile phones have actually been around since 1946, when Bell System introduced the Mobile Telephone Service. These phones worked by propagating radio signals and needed to be installed in a mobile home or a car for a power supply. Being very large and consuming a significant amount of power, these early mobile phones were impractical at first.
Fast forward to the 21st century, and mobile phones have begun to rapidly develop and evolve. Every month, new cell phone models and mobile technologies are constantly released and upgraded. Besides shrinking in size, cell phones now include additional features, such as cameras, radios, and MP3 players. Furthermore, cell phones have since transitioned from basic radio signals to GSM and 3G networks for clearer, farther, and more secure communication.
A cell phone receives its signals from cell sites or signal towers. Many of these towers are scattered across the United States to ensure coverage for every device. These towers emit and receive signals radially, with the tower acting as the point of divergence and convergence.
By taking advantage of this property of signal towers and applying high school geometry, one can trace the location of an individual cell phone with an approximate margin of error of at least 25 meters. Although everyday citizens are generally prohibited from performing these tasks, scientific researchers, engineers, police officers, and government agents can use this method to locate individuals, devices, or vehicles. If you are permitted to do so and are interested in trying it out, here is how you can triangulate a cell phone.

• Turn on the cell phone that is subscribed to any mobile service. Once you turn your cell phone on, it will emit and receive signals from different signal towers. The tracking of the cell phone's location begins here.
• Locate the strongest signal tower. First, identify the signal tower that registers the strongest signal from the cell phone. From here, draw a circle representing the coverage area of that signal tower. You now know the most probable area where the cell phone might be located.
• Locate the next signal tower. Another signal tower will also be covering the cell phone. Once you locate this second signal tower, draw another circle representing its coverage. Ensure that this signal tower's coverage overlaps with your first signal tower's coverage; if it does not, look for other towers. Notice that the circles emanating from the two towers intersect at two points. The cell phone will most likely be situated between these two points.
• Locate a third and final signal tower. Select the next strongest signal tower that registers the cell phone. Again, draw another circle that covers that tower's signal. Ensure that this circle intersects with at least one point of intersection from the previous circles.
• Locate the cell phone. If you have perfectly triangulated the cell phone, the three circles will intersect at exactly one point. If they do not intersect at a single point, the cell phone will most likely be in the overlapping area of intersection among the three circles.

One advantage of this method over GPS location tracking is that you do not need permission from the cell phone owner to trace its location. Simply by having the cell phone turned on, its location can be found.