Can an iPhone 5's text messages and location be tracked with GPS apps?

My girlfriend's ex-boyfriend apparently put a GPS tracker on her iPhone 5 and is also monitoring her texts and phone calls? Or so she thinks. He's trying to sabotage her and I'm not going to jail for physically destroying this guy. Or not yet. Is there a way to remove any invisible tracking bullsh*t on her phone so that he can't see everything she's doing anymore?

You can't track people's fones! If her ex is doing this then he hacked her fone which is against the law, best thing is to report him

Wow… She needs to lay of the sauce. LMAO! Or stop watching hollywood movies.lmao!

there no way to track a smartphone "invisibly"… If there's a tracking app on her phone, then its in her app drawer… Just uninstall it…

next… Cal the police and put out a restraining order… If he wants to play head games after that, have them arrest him!

Actually you can track a phone if the 'right' app is installed. On an iPhone there's Find my Phone.

1) Change your apple ID account password - it is requied to locate the phone from another Apple device.
2) Review all apps on her phone to be sure you understand all of them. Remove those you don't know.

She should be good.

If it makes you feel better then politely inform the ex to discontinue tracking her or you will go to court to get a personal protection order.

If you want to be paranoid back up any photos etc… On the phone that she wants to keep and then do a factory reset.
You'll then need to re-install any apps etc… But that will wipe everything, hidden or not.