If you own an Apple Watch, it really is the fastest way to find your lost iPhone.
From your Apple Watch, click the side button to bring up Control Center. Tap the icon of an iPhone with sound waves coming out of it to ping your iPhone. It’ll make a pinging noise for about 10 seconds.
If you want some visual help, tap and hold that same icon. In addition to making the pinging sound, your iPhone camera’s flash will blink on and off. This can make it easier to find your iPhone, especially in the dark.
Open the Find Devices app on your Apple Watch to see all of your devices listed. Scroll until you see your phone to see its location on the map.
Alternatively, you can ping your iPhone from any other device using Apple’s Find My app.
If you’re borrowing a friend’s iPhone to find your lost device, tap Me > Help a Friend to sign into your own account.
You can mark a device as lost, get notified when you leave the house without it, and get directions to it.
Anyone in your Family Sharing group can ring your iPhone even louder with the Find My app. And if you don’t have a family, you can use any other device signed into your Apple account.
The Apple Watch also offer advanced options for tracking down your missing device.
With Find My app, you will be able to track your iPhone 11 or newer's location even if the device is turned off, even after it runs out of power (for a little while).