So my friend recently got divorced, now the thing is, the iPhone 13 she has was bought by her ex, so we believe he is currently using the find my iPhone feature to track her location. Now i never owned an iPhone, so i don’t know shit about them.

But i think the best option would be to just buy a new iPhone and change her passwords on everything.

But now i am wondering if she should also be creating a new apple id or is changing the password enough, considering he currently has access to it?

Also, should she change the sim card? I have no idea how find my iPhone works, like if she puts the old sim in to a new iPhone, will he now be able to track her new iPhone? Obviously, we want to avoid the hassle of changing her phone number if possible, but we also want to eliminate any chance of him tracking her through her phone.

Also, how do we check if there are any apple Air tags present in her car or some shit like that?

Any help or tips are appreciated