Maybe on prepaid (pay per use) SIM cards.

Even cheapest monthly subscriptions have at least 500 messages per month bundled, with more typical monthly plans (~$15/mo) having unlimited calls, SMS/MMS messages and around 30 GB of 4G/5G data.

As far as I know Belgium, France, Germany, the UK, Greece and I think Spain and Italy have very popular unlimited sms phone plans.

Damn