Your HomePod will audibly ping nearby devices to locate them. For example to find your mobile device, just ask the speaker "Hey, Siri, where's my iPhone?" In our testing, Siri replied with, "I found CNET's iPhone nearby. Should I try to make it play a sound?"
Once the device is pinged, you'll also receive an email notification confirming that a sound was played on your device, along with a timestamp for the action.
There aren't any settings to enable, as long as your HomePod and Apple device are under the same account. So long as your iPhone or iPad has an Internet connection (either Wi-Fi or cellular) it will just work.
Here's our complete rundown ofin iOS 12.
Don't have iOS 12 yet? Here's how to.