That's not sophisticated at all. It's been around for years, and any schlub with a sufficient wealth can drive around the country with one in their vehicle and slurp up all kinds of juicy information.
Basically, now that everyone knows we live in a Surveillance State which archives and transcripts every single cell call and text of every single smartphone in the country, a person has to be a friggin' moron if they think they can have a truly private conversation, in any form, using one—unless they're using strong encryption for both voice and text. And that still leaves voluminous meta-data that can be exploited!
What everyone needs to do—and I am one of the idiots who hasn't done it yet, even though I'm an IT professional—is download and start using encrypted communication apps.
A skeptic might say "Hey if you start using that they'll know you're up to something". Well, guess what? If you are up to something and use unencrypted comm—or, say, if you simply would like to actually have something resembling a private conversation, to avoid things like blackmail or being targeted for crime—then you must start using encryption. Why? Because if you aren't using encryption, the government already knows—or has the ability to know with trivial effort—every piece of private information which you reveal in either text or voice calls on your smartphone. Anyone who thinks that anything short of that is happening is profoundly naive, or in total denial.
Once configured—and once you convince your friends and family to join you in reclaiming their privacy—encryption generally becomes completely transparent, and functions identically to the non-encrypted apps with respect to both voice and text communications.
Finally, once enough people start doing this, the government won't know what the f-ck is going on with private citizens—and that's a good thing. It'll have to actually get a search warrant based on probable cause in order to even begin to try to start snooping. Preventing—or at least attempting to prevent—both government and private snooping is completely consistent with the exercise of Fourth Amendment Rights and the fierce defense thereof, and anyone who thinks otherwise fundamentally misunderstands Individual Liberty.
Sometimes preserving Liberty can be a bit inconvenient—and every intrusive, potentially Tyrannical government lives for situations like that.
Pause for a moment to think how many Congressmen, etc. are being extorted by the Deep State, simply because it has archived everything every one of them has said or texted on a phone—along with much more—for, say, at least the last decade!
And we wonder why so many supposedly "Patriotic" Congressmen suddenly flip and do totally inexplicable things—things which coincidentally always seem to support the agenda of the Globalist Establishment, Deep State, and DC Swamp? The answer in many cases is that they've been totally compromised by virtue of their desire to have some sort of damaging information not be used to destroy them.
If we don't begin to turn the tide in bona fide ways regarding rampant Fourth Amendment abuses by all levels and branches of government—as well as countless private citizens with potential criminal intent—we are done for, and we'll become either victims of such criminals, or Rightless, de facto Slaves of the Totalitarian State, just like all of Europe submissive peons are even further down the road to becoming...
No doubt our intelligence orgs are involved. Think of all the senators and house members being monitored.
That might have worked, except that every thing is captured prior to encryption.