Stolen iPhone
I had an iPhone stolen that I’m pretty sure was factory reset and they took out the sim. Is there anyway to track it?
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Did you have the iPhone set up for Find Me?
If you did, you might be able to track the location of the phone.
Log on with your Apple ID and Password
Click on Find iPhone
Click on All Devices at the top of the next window
Select your iPhone from the list
In order to be located, the iPhone must be powered on and have a good Internet connection
More info here: If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support