mwaqastariq wrote:
this device show on my second i phone because i use my one apple id in both mobile
no have any way to find
No power? No radio communications.
No radio communications? No Find My.
No Find My, no remote position.
iPhone 8 does not have the “always on” low-powered mode that is available on newer iPhone models. And that “always-on mode still requires (a little bit of) power, and still requires (short range) radio comms.
Within Find My, lost devices without power or without comms or other impediments to locating will show their last position within roughly 24 hours.
OP does have Find My enabled on the lost and apparently battery-depleted or out-of-comms iPhone 8. (OP was incorrect about that part of their statement, and probably meant they were unable to use it in this case. The missing iPhone 8 would not show at all in Find My, if that were actually disabled.)
Very long shot: If “Hey Siri” is enabled on the iPhone 8 and the iPhone 8 is somehow out of communications range (no cellular and no Wi-Fi) but otherwise working, calling out ‘Hey Siri, where’s my iPhone” might work. That won’t work if “Hey Siri” is disabled, or if the battery is depleted, or no comms, or some other issues blocking Find My.