How do I find my sons iPhone?

If Find My iPhone was enabled before lost/misplaced,read here => If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

Jenniferwager79 Said:

"How do I find my sons iPhone?"

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Backtrack your Locations:

Do it the olde fashioned way and backtrack your locations. For instance, if you were at a retail store, then stop in, asking the store manger if it was placed aside.