Physically eliminating the RF capabilities of a device without impacting the rest of its functions is usually feasible with enough patience. Your options include blocking external radiation (add copper mesh/foil), or destroying the device's antennas.
I really love this kind of hacking but I hate several things.
1. That it's even necessary
2. That any non-techie would immediately be against even unscrewing anything on their own devices
Sure, I'm glad to do this on my own devices. But those willing to has gotta be a sample size of so small, its no bigger a deal than a statistical anomaly.
