Most of these hacks are the equivalent of hacking signal and backdooring the software
This shit is hard especially when LE is determined, but criminal syndicates aren’t dumb and hire a lot of smart people
That is, do a bunch of crap that will immediately make you stand out to any modern (by which I mean, total) surveillance agency. The syndicates' problem isn't stupidity but immodesty – typical of organized crime. They thought they were, not smart, but the smartest, and that made it easy for other criminals to sell them garbage security products.
The devices are also heavily rotated, they can also have IMEI numbers updated
To date with all of the public breach details it’s always been humint that lead to the networks being taken down
Not exactly, because that would depend on how competent the network is. For a "dumb" network yes, they won't know whether it's a 4g hotspot or not, but it's conceivable that an all-knowing adversary (eg. NSA) can infer the make/model of the phone based on fingerprinting or even the IMEI.
When I was 13 for sure being the hacker in a crime organization would have sounded somewhat appealing.
There was a case where a company was selling a "PGP phone" where it turned out that, to save having to bother the customer with key generation on the phone, they were doing it on the servers[1]. So the police grabbed the servers with all the private keys and there were a lot of sad customers.
To do end to end encryption in a way that works, there is a minimum level of understanding required. These "secure" phones are really a type of scam that preys on the not sufficiently informed.
[1] https://securityaffairs.co/wordpress/57036/cyber-crime/black...