Start with Apple Find My. You can use iCloud Find Devices from a browser even when the missing iPhone is your trusted device.
Go directly to Apple’s official Find Devices service from a browser.
Lost Mode locks the device and can display contact information.
If the phone appears at an unfamiliar location and theft is suspected, contact law enforcement rather than retrieving it yourself.
Suspend or transfer service if the device is not coming back.
Depending on your situation, you may need a replacement phone, portable charger, tracker, travel connectivity or device protection. Recommended products and services will always be separated from official security actions and clearly disclosed when a link may earn a commission.