Verizon, posing as Spectrum Mobile, just offered me "unlimited services" for $17.95 a month, assuming I use their cell phone. It turns out, the phone has a removable battery. Of course, I turned down the offer.
RAM retaining information after the power is off even in desktops (acting as an EPROM) has been around for over 10 years. Your hard drive reporting everything you do on your computer as soon as you connect to the Internet has had a hardware feature to do the same for at least 6-8 years by now. Windows 10 already has a keylogger built in and all the previous versions of Windows had back doors through which everything on your machine was accessible for those familiar with the feature (they changed it periodically; hence come the so-called “Windows updates”). After the “Patriot” Act, security programs have been simply collecting your data and sending them to the appropriate agencies that, for a while, used to be country-dependent (they spied for the country from which they were operating), but that sort of thing ended about a couple of years ago, thanks to the worldwide cooperation in the name of “public health” or something.
At this point, apparently, there is a battery backup in cell phones with removable batteries, too. A Faraday cage will do nothing, except delay the inevitable; the recordings will be forwarded as soon as the phone is connected to a network. Locking the device in a sound-proof box or keeping it away from everyone does work, but it might raise a red flag.
I'm wondering when removable batteries truly disabled cell phones last time... My five-year-old Samsung eats up half of its battery life even when turned off overnight and I forget to remove the battery. (Well, otherwise, it’s usually on for 2-3 minutes a day, while I check for messages.)
After 2001, everything is recorded. First, it's analyzed by a computer for "catch phrases." It's all "evaluated" in relation to everyone you've ever talked to after the recordings started. Next, a few simians posing as humans make attempts to filter out stuff that might interest their bosses. Eventually, a last tier of subhumans look for "codes" that are not there, but they can compile them out of nothing.
The most danger these servants of Evil pose comes from their eagerness to "prove themselves," because they have to prove they deserve their six-digit salaries from taxpayer funds. As a result, they create cases and once they call you a t*, you can be held until the cows come home without an explanation or a legit charge. They can also take everything you say out of context, so even the most innocuous statements can end up incriminating you.
Those who are lucky, might be able to keep a neighborhood together, but I'm not sure how reliable that sort of thing is, once there is not enough food.
Let's not forget that End To End Encryption is dead. :(
https://www.youtube.com/watch?v=c52pKpYeZ74
His privacy information, especially in regards to phones is the best I've found.