Your Apple Watch is a fantastic tool that lets you perform daily tasks on your iPhone. Notifications are filtered, you can respond and you can even use Apple Pay to buy goods and services. Your Apple Watch is also a valuable asset when it comes to finding your lost iPhone.
Of course, you can search the iPhone via iCloud on the web or on another iOS device to track your iPhone's location or have your iPhone ring so you can find it under the bed or on a couch cushion. But your Apple Watch should always be your first option as it's so easy to toast your lost iPhone right from your wrist.
You can not see the exact location of your iPhone on the Apple Watch, but you can send it a beeping "I'm over here" alert. You must be either in Bluetooth range or connected to the same Wi-Fi network. Therefore, it is only useful to find your iPhone if it is located somewhere in the house and not somewhere in the city is missing. If you use the Apple Watch Series 3 (GPS + Cellular) model, mobile data alone can not be used to locate an iPhone.
In cases where your iPhone's speakers are not working properly or it's very dark, you can even make the device's LED flash to get a visual indication of where it is.
Let your iPhone beep
To ping your iPhone, wipe it from the bottom of the dial to open the control center. Ping iPhone "button (it looks like an iPhone is ringing).
Your iPhone sounds loud to make it easier for you to locate it (even if it's muted.) Sounds are emitted from the iPhone for only a few seconds. so that you can tap the "Ping iPhone" button again (and again) on your watch until you find the iPhone, you do not need to wake up or unlock your iPhone to stop the beeping.
Brightly illuminate your iPhone  If your iPhone's speakers are not working or muted at all, because of water or whatever, or if you're in a dark area, you can also flash the LED with the Apple Watch on your iPhone.
Go Just as with pinging with sound, touch and hold the icon for about three seconds instead of tapping on the icon. The LED on the back of your iPhone will flash for a few seconds, for a total of five Flashes, and the iPhone will also hear the ringing. Repeat this process as needed.
If the ping option is disabled, you are out of range of your iPhone, not connected to the iPhone's Bluetooth, or turned on the same trusted Wi-Fi network like the iPhone. At the top of the Control Center, "Disconnected" may be displayed.
To be on the same Wi-Fi network, you'd need to have Bluetooth and Wi-Fi enabled on your iPhone and then be connected at least once. Use your Apple Watch at some point in the past. The Wi-Fi network must be 802.11b / g / n 2.4GHz so personal hotspots and the like will not work.
You can see if your Apple Watch is connected to your iPhone via the green phone icon via Bluetooth on the Control Center screen of your Watch. If you see a Wi-Fi icon instead, it means that you're connected to a Wi-Fi network, probably the same one your iPhone is connected to when it's in the same place.
If your iPhone is not within reach of your Apple Watch, pinging or flashing will not work, so you'll need to jump to iCloud or use the Find My iPhone app on another iOS device to track or ping it ,