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Spy on your family member's movements for just 10 Dollars a month! Satisfaction Guaranteed or your money back!
(sh.itjust.works)
This is a carrier in the USA (T-Mobile).
I did a quick search for the other 2 carriers using the term "[Carrier Name] Family Tracking" and Verizon and AT&T also seems to have it.
And according to https://www.t-mobile.com/support/plans-features/t-mobile-familywhere-app, it says:
FamilyWhere uses geolocation data from the T-Mobile network and is not affected by changes to device location settings.
So it appears that its using cell tower triangulation. Turning on Airplane Mode should stop it (assuming there isn't a separate tracking app on your phone)
Oh Wow, What a wonderful tool for abusive spouses and abusive parents. And telecom companies are making money off of it. ๐
TLDR: Its a good idea to get your own separate cellular plan.
Lol, this is literally a privacy community, why do you think people would use a throwaway account?
And its sarcasm. Someone posting a "Hire a hitman today!" isn't actually advocating murder, just to point out the absurdity of the situation.
But it's fine, I get it, sarcasm is hard to understand.