How can I disable my stolen iPhone?

If you had Find My enabled on the phone go to https://icloud.com/find and put it in Lost mode, then see this→If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

You can also request that your carrier blacklist the phone’s IMEI.

Beware of a common phishing scam: You may get a text or email from “Apple” or “Apple Security” (or sometimes “Police”) saying your phone has been found and to click on a link to see its location. This is NEVER from Apple or from law enforcement; it is from the thief or fence to steal your Apple ID and identity. Delete any such message without responding to it. Apple never gets involved in lost or stolen devices.

Click here for information; all of your options will be available through Apple's Find My service or by asking your wireless carrier to blacklist it.

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