[Scoundreller]

I thought SMS gateways weren’t really used anymore and the way to go was to buy a bunch of prepaid unlimited SIMs and blast out messages at a below-detection rate through thingies that rotate between 64/128/256 SIMs and 8-16 radios.

Like shown here: https://au.finance.yahoo.com/news/how-one-man-allegedly-cost...

The IMSI catching approach, wow!

[londons_explore]

Many simply get some proportion of their customers to install a malicious app which sends the spam from the victims phone number.