No I work in telecom and he's not onto anything. It's technically impossible for one, and the ROI wouldn't be there even if it was.
The ROI on spray and pray is high enough. (EDIT: Not as high as like actual legit telecommunications services but it takes a tiny fraction of the expertise.) Literally all the information they need is your phone number. They just spoof the "from" number, often to appear to be a toll-free number or a number in your area code and crank out as many calls as their carriers will let them without shutting them down. The underlying costs are cheap enough where only a teeeeensy percentage of people have to fall for it for it to be worth it.
