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https://www.ifixit.com/News/apple-is-locking-batteries-to-iphones-now
By activating a dormant software lock on their newest iPhones, Apple is effectively announcing a drastic new policy: only Apple batteries can go in iPhones, and only they can install them.
If you replace the battery in the newest iPhones, a message indicating you need to service your battery appears in Settings > Battery, next to Battery Health. The "Service" message is normally an indication that the battery is degraded and needs to be replaced. The message still shows up when you put in a brand new battery, however. Here's the bigger problem: our lab tests confirmed that even when you swap in a genuine Apple battery, the phone will still display the "Service" message.
It's not a bug; it's a feature Apple wants. Unless an Apple Genius or an Apple Authorized Service Provider authenticates a battery to the phone, that phone will never show its battery health and always report a vague, ominous problem.
(Score: 1, Informative) by Anonymous Coward on Thursday August 08 2019, @01:06PM
When not in use, a small Faraday cage will block any kind of tracking, just say'n.
(and just to say the obvious) When in use, every cell phone has to be tracked as part of finding a base to connect to.