PocketBook app on Android connects nicely to the Calibre Content server, when I'm on my own WiFi. See OPDS.
I find it the best Android app, and on a big tablet it's good for PDFs too. I've used other apps on older phones.
The Kindle App contacts Amazon even if you didn't start it. Background data has to be disabled as well as main data to stop it communicating on your mobile/Cell connection. It re-enables at power on if disabled.
The solution is to uninstall the Kindle app, That does mean you can't use Kindle Unlimited and you need an eink Kindle (older but K3 or later is best) to buy ebooks from Amazon now than Download & Transfer is gone.
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