Don't phones have identifiers outside of phone number anyway? I feel like you have to trust the hardware/os vendor anyway. So if you don't trust apple to not misbehave, maybe not getting an iphone is better than chasing the whole phone-number idea.

Your comment isn't super clear to me, let me know if I misunderstood anything.

Yes there are still identifiers when using cellular data service, but they aren't connected to your phone number that you give out. Phone number gets a determined threat actor real time location, which is what I explained. Threat actor gets location from any carrier identifier. Cellular was built in a terrible way for privacy and security.

Android doesn't let apps see hardware identifiers if that's related.

Yes you're correct about having to trust Apple, but my point is that the way Apple is collecting all this extra info allows them to be compelled to hand it over. It's not about trusting Apple, it's about them following the law, which they will do.