Here we go again. Please don't start with the vaccination controversies. People really need to stop the nonsense related to anti-vaccination and they need to stop going off topic. Not getting a vaccine puts other people at risk besides you. Anyhow we should stick to the topic.

Exactly. I've already stated that there are people who know a lot of numbers, and they are (sometimes much smarter) people who can barely remember two. It isn't just about phone numbers, but rather memorization.
It all comes down to how you search, process and store data in your brain.