Find iPhone From Apple Watch
From Apple Watch Can I see the location of my iphone on maps
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You cannot. You can play a sound on your iPhone from the Apple Watch however if it is within Bluetooth or WiFi range. You can do this by swiping up to Control Center and tapping the button with an iPhone and three lines on the side.
If you need to locate your lost iPhone, do the steps in this article: https://support.apple.com/en-us/HT201472
