Not using a smart phone atm, but this is my backup device for occasional quick photos/2FA etc. and it is fine for the job and doesn't leak data. It does try to

Not using a smart phone atm, but this is my backup device for occasional quick photos/2FA etc. and it is fine for the job and doesn't leak data. It does try to get updates and info from Canonical, but I block that in my pihole setup. It doesn't do anything else, from what I can see, over the network.