Privacy advocates got access to Locate X, a phone tracking tool which multiple U.S. agencies have bought access to, and showed me and other journalists exactly what it was capable of. Tracking a phone from one state to another to an abortion clinic. Multiple places of worship. A school. Following a likely juror to a residence. And all of this tracking is possible without a warrant, and instead just a few clicks of a mouse.
You and I must live in two different societies then. I work with at least two other individuals who also don’t have a cell phone (not just smart phone, but any cellular device), one of whom is also a millennial. My SIP number has never had any issues with online service auth.
We absolutely do the society I live in even the homeless have cell phones and I haven’t ran into anyone without one in decades
To be fair, I don’t go around in public telling everyone “I don’t have a cell phone btw”. So I suppose we are easy to miss.