The Hated One has a couple of videos on how a phone finds you location - there are 5 or 6 methods.
Youtube https://youtu.be/WkmTxBTe52o
Bitchute https://www.bitchute.com/video/WkmTxBTe52o
I was going to post the link to his older video but it was made 6 years ago.
That is a question your brother needs to ask their doctor.
I don’t wish to add complication but Calyx paused all updates for 11 months but they are back. This could happen again which would force you to either have an insecure OS or install something else. More details on Wikipedia.
First you have to be a good con artist with no morals. Are you comfortable ripping of your victim?
Your welcome. I hope the vid helps.