I dont know about other models but I think I have managed to limit how much my phone (fairphone) spies on me quite decently.

I installed application called ReThink, which is basically a firewall and I can block even google services with it. I know it works because its really pain in the ass when I want to use their services like calendar and i have to temporarily unblock it. It can also block ads by completely blocking internet for programs that dont really need it. I have also removed/disabled anything extra and removed permissions to anything that absolutely doesn’t need it. It also alerted me to that stupid google safetycore spyware being installed (by blocking and informing about newly installed program) so i managed to remove that immediately.

At least according to the logs the phone seems secure, since nothing is being allowed to connect anywhere that shouldn’t be allowed. Can’t do much to occasional breaches due to restarts or temporary allowings, but I dont think such sparse information is much use or it might require more effort to utilise.