Since I use unique alias email for most accounts, newsletters, shops and services, I feel the power of it regarding privacy, security and spam fighting.

Now I want to have the same for phone number. A unique number for each SMS verification code, services, insurance company, ... then I would know exactly where scammer and spammer get my number from and block the number on my side instead of blocking the scammer number which change everytime.

Any idea how to do that without spending a fortune?