How can I find my lost iPhone when it doesn’t appear in my find my iPhone?

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Find My - locate offline device   

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I am in situation similar live moments and read “that their is no apple software to use if has been removed from trusted devices and find phone on iCloud etc.

“ notice the (no apple software or mentioned way ) my thought is if have the MAC address it was born with the how do we search the www for one max addesss