welcome, there are no free options in Europe to my knowledge. If you want you can give baiting investment scammers a try.
While you need a voip number as well, you only need one to receive inbound calls (they will call you). I have a UK number from Zadarma (around 2-3 bucks a month)
you can give talkatone a try, but if you want a good us number, you can try telnyx or zadarma (note that they are paid and require kyc proof of identity.) for a uk voip you can use numberpeople, they are cheap and dont require kyc. its good for baiting printer support scammers running uk campaings or the fake investment sites like Dubloox pointed out. Have fun baiting!