A dead or offline iPhone may still show a recent or last-known location. Do not assume that “offline” means there are no useful next steps.
Open Apple Find Devices and select the missing iPhone.
Apple may show a last-known location depending on the device, settings and timing.
Lost Mode is still an important protective step.
If it does not return online, protect your number and accounts and consider replacement options.
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.