Hello they stole my phone how can I lock it

Click here for information; all of the options for locking it are available through Find My or by asking your wireless carrier to blacklist it.

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Using the find my iPhone app. Log into the app using your Apple ID. From there you’ll see “your devices” select the stolen device. (You’ll also see it’s last location if it’s charged an emitting a gps signal) then choose the lock feature.