My iPhone was stolen. How can I block it or find it?

Check this link...

If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

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

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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→Avoid phishing emails, fake ‘virus‘ alerts, phony support calls, and other scams