This is much better than phone jammers, which some venues tried about a decade ago. The FCC and telcos have been reasonably successful at stopping that.[1] Many (most?) cell phone sites now detect and report interference, so jammers get noticed quickly.[2]<p>The company that does this will probably lose a few percent of their cases per use, but, like 3D glasses, most people will return them at the drop-off bins.<p>[1] <a href="https:&#x2F;&#x2F;www.fcc.gov&#x2F;encyclopedia&#x2F;jamming-cell-phones-and-gps-equipment-against-law" rel="nofollow">https:&#x2F;&#x2F;www.fcc.gov&#x2F;encyclopedia&#x2F;jamming-cell-phones-and-gps...</a>
[2] <a href="http:&#x2F;&#x2F;www.tbo.com&#x2F;news&#x2F;business&#x2F;fcc-seffner-man-was-using-cell-phone-jammer-20140429&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.tbo.com&#x2F;news&#x2F;business&#x2F;fcc-seffner-man-was-using-c...</a>