I mean, that won't really work. It dampens the signal, not eliminates it, and in order to block communications, you need a net width small enough to block 1/4 wavelength which is 5cm/4, so <1 cm holes with a material thick enough for the damping.

That would be a net that weighs like 20kg lol and it would essentially be a solid cage at that point

Not to mention that it would have to fully encompass them.

Better to just use a signal jammer like they do for drones.