Just don't make the mistake and give your phone number to any American companies. I did so when starting my current job since I didn't yet have a company phone number, and I suddenly started receiving multiple spam messages daily, which has been going on for years now.

To add: it's not about targeting rich markets, either. I have a number from the Netherlands and Germany and neither gets more than one spam SMS per, eh, year maybe on average? Some years none, some years three or so perhaps? When COVID was new, I also got a few spam calls (as did my family around the same time, so I guess it was briefly a thing), but that seems to have stopped again. I've had the Dutch number for 20 years and it's in public records, so it's not brand new and unknown either