I lost my phone and don’t know if I had set up my find my iPhone
how do I set up a find my iPhone on a different device
iPhone 6s
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You can't set it up once the device has already been lost.
Log into your iCloud account at https://icloud.com/find
If you had set it up, the device will be listed there. If you didn't, there is no way to add it after the fact. You need physical possession of it to enable that service.