Hacker News Reader

It's most surely not the hacker's phone number.

Definitely: “hackers phone number” is an oxymoron, because no somewhat experienced hacker would ever give out their personal number.

Don’t be shocked if it’s some twilio or google voice number

It IS possible that they screwed up. But yeah, I doubt it

If you attack the number you might hit an innocent bystander whose number as been misused by the hacker.