How does one minimalize privacy concerns on SIM cards and phone numbers

Mainly to not have some services that strictly requires phone numbers, IE WhatsApp etc. to have a phone number that is tied directly to me. I don’t mind having sim card, but I prefer it to only be used for data purposes so it’ll be a prepaid card. And have something else for everything services that requires phone number. And if need be might when get a second sim only for registration when VoIP furent work, don’t know if it’s viable though