How can I disable my lost iPhone?

The Complete Guide:

▷ Follow these important steps.

▷ Call 1-800-MY-APPLE.

▷ Learn how to file a claim.

▷ Get Support.

▷ Download the Apple Support app.

If you had a good passcode on your iPhone and Find My was enabled no one will be able to get into your iPhone or use it. If your iPhone is turned off or the battery is dead you won't be able to remotely do anything with it.

Apple doesn't get involved with lost or stolen devices.

Follow directions here:

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