Because a signal jammer doesn’t work just in a range, these things jam by creating noise in a certain radius, but more often than not this noise acts like a wall and blocks signals outside the actual radius, and if you have the thing near a tower it blocks every connection to the tower. Jammers are illegal in almost every country because of that, imagine the things blocking emergency calls, among other very nasty problems.
Because a signal jammer doesn’t work just in a range, these things jam by creating noise in a certain radius, but more often than not this noise acts like a wall and blocks signals outside the actual radius, and if you have the thing near a tower it blocks every connection to the tower. Jammers are illegal in almost every country because of that, imagine the things blocking emergency calls, among other very nasty problems.