You can make a call private by hiding your phone number in a few different ways, including using your phone's settings.

You can block a number on your phone so that a person or company can't call or text you from a particular number. Here's how ...

Install nmap if you don't already have it on your Linux computer. Run "sudo apt-get install nmap" on Ubuntu, or "sudo dnf install nmap" on Fedora. To investigate devices, try looking up OUIs, scanning ...