How to TRACK WHERE MY IPHONE IS (Emergency) (stolen/lost)?

Last night my iPhone was Lost but all the signs are leading to it was stolen. Sadly i did not have a tracking app on it and i called at&t. They just kept me on hold for hours on end and then later told me there was nothing they could do with out that app. I have insurance on it but had a real attachment to that phone. There has to be a way i can track it from some type of Satellite! Can someone Please help me Fast! I would truly be grateful!
Is there a way for me to track it online or Anything at all i can do to get it back?

Added (1). Also when ever i go on iCloud and try to track it, it says my phone is Offline and needs to connect to a Wi-Fi source. I don't think this means its off because when i call it it will still ring meaning its battery is not dead.

Yes download the app find my iphone for someone you know, then sign in using your apple id n then put it in lost mode and track it.

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