Comment by lstodd

Actually no, overload is easily avoided even on cheap chinese 20-channel LTE base stations (aka tower segments) if all you do is just rotating SIMs and sending some SMS.

Logically one would switch sms-sending using some number of (fixed or mobile) sdr-based simboxes so that they would even appear to move around the city randomly.

Those guys did it on the cheap. But then they did not expect SS to drop on them.