How to stop Malicious location application?

Asked by Axemusica (9500) December 5th, 2016 from iPhone

Hello Flutherians, it’s been a while. Anyways….

I have a friend that recently broken up with her boyfriend & he seems to always know where she is & can find her on a whim. We’ve figured out that he’s using an app on his (I believe it is an) android phone called xFI Locator. She’s starting to get a little concerned as am I. How does this app work? She didn’t set this up & she doesn’t like it. It’s creepy to me & is starting to sound malicious. How to we stop it from working? I’ve googled & can’t find this particular information.