An old data breach is still a data breach, and youre probably still going to need to pay attention to it. The leak involved old data that was previously reported on in 2019 Some reports say the data was scraped in 2019, others talk about early 2020. Access to personal data allows cybercriminals to seem more believable when they pretend to be somebody, making social engineering and ID theft easier. There are a few sites that offer you the chance to look up your phone number and see if it’s been leaked.”]
Source: https://blog.malwarebytes.com/social-engineering/2021/04/has-facebook-leaked-your-phone-number/