Find my phone via imei
My friend's iphone was stolen. How can I locate the device using IMEI#?
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You can't find an iPhone using IMEI. In order to track a lost or stolen iPhone, Find My must have been enabled before the phone went missing. The cellular provider can deactivated the phone by IMEI and can blacklist a lost or stolen iPhone.
See this link on what to do if your phone is lost or stolen --> If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support