Keberoxu, you can set up a Google Voice account and port a mobile phone number into it to keep forever. The catch is that you have to have a phone number that it can forward any of those calls to. Do you have a different phone number now? Google has a one-time charge, maybe $25. I did that with a cell number that was once my house number. For a dozen years it has been my Google Voice number and it is the one I give in stores when they ask for a phone number. So it catches all of the spam. The account is set to only forward numbers from calls in my contact list. The rest go to voicemail, set upon Google Voice. I can also use it via computer and send text messages through it.

You can also set up a Google Voice account and have it assign you a number. But you still need a phone for it to occasionally forward calls to.