Lost my iphone
If I know my Phone’s IMEI number . How I could find it when it’s lost
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You need the Apple ID that you used for iCloud. See: If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support
including the following from that link:
Find My iPhone is the only way that you can track or locate a lost or missing device. If Find My iPhone isn't enabled on your device before it goes missing, there's no other Apple service that can find, track, or flag your device for you.
