Let's Understand the Privacy Risks of the Phone Network

The phone network has many aspects, the Public Switched Telephone Network (PSTN) itself, SS7, data SIMS "privacy" or no KYC SIMS, burner phones, hotspots, VOIP, Wifi Only etc. A pretty complicated thing to understand. But not really. This will be a primer as many of you have questions on how to enhance your privacy by changing your interaction with the PSTN.