If your cell phone is equipped with a Global Positioning System (GPS), it can be used to track your location. Federal e911 rules require service providers to provide your location when you dial 911. Because of this, your cell phone is essentially a homing beacon. Your cell phone is transmitting your location all the time, not just when you use GPS or call 911. If you're worried that your phone may be used to track your every move, you can block the signal with a cell phone jammer.
Buy a cell phone jammer. This device will prevent your phone from sending or receiving signals. The more expensive jammers will block any cell phone in approximately a 100-foot radius from sending signals to a cell phone tower. The cheaper ones will block signals in about a 15-foot radius. You can find a link to buy jammers in the Resources section.
Turn on the cell phone jammer when you want to jam the signal. Most jammers simply flip on, and some will work with the push of a button. The jammer itself is about the size of a cell phone and should be kept in close proximity to the cell phone for it to work well. You can keep it in your pocket and carry it around with you. Many people slip it into an empty pack of cigarettes and carry it around in their pocket.
Shut off the jammer when you're not using it. Leaving it on could cause the jammer to interfere with other radio signals in the area. It could also jam other cell phone signals in the area.