There are a myriad of ways to work through signal jamming.Something designed to work in a battlefield can utilize one or several methods. Most civilian devices

There are a myriad of ways to work through signal jamming.Something designed to work in a battlefield can utilize one or several methods. Most civilian devices aren't designed to do that because it's usually more expensive. There are also nebulous arguments about hindering law enforcement (but also counter-arguments about criminals eg "if you outlaw guns then only outlaws will have guns").