Find my iphone
I can’t find my iPhone 12. How can I search for it on my iPad Pro?
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Locate a device in Find My on iPad - Apple Support
Here is Apple’s advice for lost or stolen devices:
If your iPhone, iPad or iPod touch is lost or stolen – Apple Support
Use the Find My app to locate a lost or stolen device – Apple Support
If the Find My iPhone/iPad feature was enabled prior to it being “misplaced”, then if active, you would stand a good chance of locating it.
However, if the feature was not activated prior to being misplaced - or the iPhone/iPad has been inactive for more than 24 hours, the last known location will not be available - and the opportunity to use technical means to recover the iPhone/iPad have been lost.