How to block stolen iphone 5?

Ah sorry for your loss, please follow these steps.

1. Go to iCloud.com (Type in your Apple ID and password)

2. Click the Lost my iPhone icon

3. Select the All Devices Icon

4. Click Lost mode

I believe this will at least lock your iPhone. I have not used the feature but I do believe that this will help protect your information on your iPhone. I highly recommend using this if your iPhone is lost!