how can i help a friend find his stolen iphone

Did he enable Find My?

1. If your iPhone, iPad, or iPod touch is lost or stolen - Apple ...
2. Find the serial number or IMEI on your iPhone, iPad, or iPod ... You cannot track using iMEI number. but you may need it so keep it handy

If you didn't turn on Find My [device] before your device was lost or stolen, it can't be used to locate your device. Change your Apple ID password. Change the passwords for other internet accounts on your device. This can include email accounts, Facebook, or Twitter etc...

Don'ts

If you remove the device from your account after you erase it, Activation Lock will be turned off. This allows another person to turn on and use your device.

Do's

• Mark As Lost.
• Erase your device.
• Apple Care+ :- file a claim for your lost or stolen iPhone. (If you had Find My enabled)

maximusyvel Said:

"how can i help a friend find his stolen iphone: how can i find my stolen iphone"

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Non-Technical Methods of Retrieval:

Whomever's iPhone this is, as for non-technical methods to track this down, backtrack where you may have been while and before this theft occurred.

Also, stop by public locations (i.e. a retail store), and see if was safely put aside. If you are on a college campus, check with the dorm master or campus administrator of sorts.