re: Is there a way to spy on someone without an app?

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My sister's bf had downloaded a tracking app on her phone. She found it and deleted it. He's still telling her when she's with her other bf in such and such area. He said he just types her phone number in some website and it tells him where she is. She says she's been through all her apps and it's none of them.

She has a galaxy 3. I said maybe there's an invisible app

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