3 ms·
Huh. I seemed to recall that Snowden made guests put their phones in the refrigerator, which is the same principle. So I went and tested my phone in on the wor
by sbierwagen 12y ago
Huh.
I seemed to recall that Snowden made guests put their phones in the refrigerator, which is the same principle. So I went and tested my phone in on the work fridge, and you could still make calls to it.
Filing cabinet, ditto. Mylar antistatic bag, (which has a conductive layer, though not very conductive) ditto.
Tried some conductive fabric, which we sell for e-textiles stuff, and which the manufacturer's datasheet advertises as providing some 85dB of RF attenuation, and sure enough I couldn't call my phone anymore.
- Scorponok 12y agoI assumed the fridge was more about "make sure the microphone can't pick up anything from outside" than blocking radio signals.
- manicdee 12y agoSwitched off, in a tin can, in the freezer. Tin can to block radio signals, freezer to block audio signals. And switched off so the "normal" operation of the phone doesn't drain the battery (i.e.: continually trying stronger signals to reconnect with the GSM/3G/4G infrastructure).