i lost my phone and its dead i need last location

Assuming that the Find My option has been enabled, the iPhone cannot report on its location unless it is powered on and has a good Internet connection. Depending on how long the phone has been out of contact it might or might not display a last known location.

If your iPhone 12 Pro Max is lost and the battery is dead, then there is no way for it to connect to a network and report its location. The last location may not be displayed if the iPhone has been out of reach/power for a long period of time.

Axel F.