Can my phone be tracked if location Services is off?

Yes, both iOS and Android phones can be tracked without a data connection. There are various mapping apps that have the ability to track the location of your phone even without the Internet connection.

How do I turn off GPS on my phone?

Turn Off GPS On Android

Open the Settings app and go to Security & Location. Under Privacy, tap Location. Turn the Location switch off. This will effectively disable GPS on your phone.