[draygonia]

You can easily check databases on and off the darknet to find people's phone numbers and most people don't have multiple phone numbers and rarely change their number because of the associated hassle with moving accounts. The same goes for their email and even passwords if they reused them.

[mikeiz404]

For example https://truepeoplesearch.com will give you name, address, and phone number for free and it is searchable.

It’s unfortunate how much is out there.