Recently, a school principal in Spokane, Washington, bought a phone scrambler to keep cell phones from running while students were in class. The scrambling device was turned on during school hours and turned off during transit times and lunch time. His reasoning for the measure was frustration by the continued distraction of texting and cell phone calls during the course.
A month ago, he found an Internet store and bought specialized equipment in China to block telephone signals.
When I was at school, I was really interested in learning and having fun at school. The use of the phone never crossed my mind.
The main feature of RF Design u-blox is its cross-frequency work. No matter what kind of model is built-in into the tracker, be it LEON or LISA, it can easily adapt to such frequency bands as 2G (GSM, GPRS, CDMA), 3G and even 4G to use them as the auxiliary frequencies when the main GPS tracking frequency cannot do its job, for example, when you are in the tunnel or in some other place where GPS cannot reach you. Still that is not all that it’s got.
The frequency ranges mentioned above are used for few things. First of all, if the original GPS tracking of this system is being jammed, the RF Design u-blox detects that and uses its wireless frequencies to send the signal to the base station about its being jammed by the GPS jammer at this very moment. But if you think that its tracking came to an end, you are wrong. This u-blox microchip uses cell phone bands to triangulate your location by means of cell phone towers, regardless of the mobile phone operator you are using.