how to find your iphone if its dead

Hello ~ There are still some things you can do…did you have Find My activated? Take a look here:

Use the Find My app to locate a missing device or item - Apple ...*

*Don't see your device?

You might not have Find My turned on. If your device is powered off, the battery has run out, or more than 24 hours has passed since its last location was sent to Apple, you can't see your device's location. Learn how you can still protect your information.

~Katana-San~

Can't be done. Once it powers down, Find My doesn't work and one can't just call to hear a ring/vibrate.