Cell phone signals can be jammed fairly easily. It's illegal to do-so in the states, but the devices are pretty easily obtained from what I've read. I'd imagine even easier in other countries.
They are easy to jam if you don't mind also not having GPS, Wifi and 3G/4G/5G service. You can do selective jamming but this is much more sophisticated
I certainly hope that there's some sort of channel-hopping strategy in place to prevent accidental jamming. In fact, I would hope that "can't be accidentally jammed by a bunch of 14 year olds on their cell phones," is a lower-bounds for measuring the efficacy of the system.
If I were go to such great lengths and finally resort to order a multi-frequency signal jammer isn't the next follow-up question: Is it powerful enough? Or could it disrupt like ... I don't know ... 911 calls in the vicinity? No experimenting? Really desperate, I guess.
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