If you want to install free tracking tools, you'll need consent or try to guess the lockscreen password to try to install it covertly.

With this, its doesn't require consent, since most families are on the same family plan.

Only abusers would use this, since a normal person who actually cares about a family member's safety would just ask them to install a tracking app voluntarily and be transparent about it.

Its tracking either way, but doing so voluntarily is way less creepy and also free.

Most modern Android and iOS allows you to share your locations for free via Google and Apple "Find My Phone" networks.

I'm sure that the "consent" is part of the terms and conditions when you sign up for a line on a family plan. Not that it's genuinely informed consent, or that people know what they agreed to, but technically...

But you need geolocation. This, at least, can track you scarily accurate. Cannot escape it except you have more money depending on which situation. (Like parents giving it for free to the child, so the only escape is to either have secretly a second phone with own carrier plan or be open and purchase your own carrier plan by gaslighting its needed)

This is a problem even without this. The account owner can get lists of all outbound calls of their victim's line if they share a plan.

The fcc requires some remediation if a domestic abuse order is submitted but obviously that's at the far end of the abuse cycle.

The issue here can be traced all the way to phone companies pushing the very concept of family plans because it makes churn more difficult.

An abuser can shut off their victim's phone line on a whim with convenient online interfaces.

Phone companies don't treat their customers will respect because their is no requirement. No one of adult age should be subjected to any of these controls simply because someone else pays.

The health industry has rules around this. The moment a child hits 18, their claims disappear and the parent loses access to medical records.

There is absolutely no reason phones should not have the same restrictions but the industry lacks the will and will until the fcc or other three letter agency forces the issue.

then yes you should have as much financial separation as possible.

Yeah that's a thing people in abusive households frequently have.

The carrier can track a phone without sim card but it's not the case if you turn on airplane mode. The whole point of airplane mode is to prevent the phone from emitting any signal to avoid interference with critical aircraft instruments. I don't see any company risking to circumvent such a critical security feature, it would be easily verifiable.