Cell phone tracking is common place. If you carry one, you’re being tracked, profiled and having your data correlated with others. The question is whether you support living in a surveillance society. If you do, grab a cell phone and be happy. If not, get rid of it and use alternative communication methods. It’s a simple choice. In my experience, most people choose convenience over privacy.

You are correct. Streams is Fediverse software that you install on a server.

I initially misunderstood your question, so deleted my post. Sorry about that.

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Conversations, Cheogram, Dino are the ones I’ve used.

There is no such thing as a private cellular device. It does not matter if it’s a smartphone, dumb phone, or simple internet access device.

Cellular devices are location tracked and their owners profiled. All devices have proprietary cellular modems that communicate over the network and have full access to your system. Nothing you do on device will stop that.

The only exception I’ve heard of is from Purism. The Librem 5 claims to separate the base system from the cellular modem, but that still won’t stop the location tracking.

Point blank, you can’t carry a connected cellular device, and have privacy. They are mutually exclusive goals.