Comment by youcouldalways

Changing your number every year could mitigate as it would introduce entropy and stale data into the system. When done at scale, data lifetime would behave similar to the automatic deletion of messages on whatsapp. Somewhat mimicking an in person verbal conversation where only people's memories remember what was said and even their version gets changed every time memory recall takes place. Systems already exist in real life that protect privacy, it's just that we do a poor job of reproducing them with tech.

Changing your telephone number every year could be an artificial holiday like valentines day or halloween. It can be done if people deem it's important.