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I bought a SIM in Brazil a few years ago and was bombarded with text spam within minutes of putting the card into my phone, most of it from the carrier.

Looks like other countries have it too. What country were you visiting?

https://www.statista.com/statistics/1045618/spam-calls-per-m...

Paywall

In the UK we have it, but not as bad as in the US. In Germany we don't seem to have it at all

Can confirm. From Germany, have the same number for 15+ years, basically any provider has this number and probably leaked it at some time. Still no spam at all. I think there are heavy penalties for that in Germany.

In the Czech Republic I get like one spam call per year, and it’s usually semi-relevant (carrier, bank, insurance), virtually zero scams or blind marketing calls.

Same phone number for 17 years, dozens and dozens of companies have seen it.

Perhaps your "in country" number was not circulated well enough in the spam networks in a duration of one month?

If you get a new number in the US you'll likely have a similar experience