If you restore and reset your iPhone, can the phone still be tracked using GPS or location devices?

I have already taken out the SIM card, my ex-boyfriend gave me the phone and now I just want to use it as an i-Pod touch. I just don’t want him to know where I am at all times and he said he downloaded or is registered to something that allows him to track the phone whenever he wants because of the GPS or some special number. It really freaks me out and any information on this would be so helpful! Thank you!

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