lock the phone by telling your sim provider, or better yet get the cops involved
Or you could just use Find my iPhone and actually prove it.
Not true. It's not installed on my phone. You just sign into your iCloud on any computer, and it will locate your phone.
You realize that the iPhone 4S can be tracked? Call Apple to see if they can help you, then call the cops. The best revenge would be to see the ***** hauled off to jail for theft.
Looks like plenty of copies are available. It's old and out of print, but just reading it will make you laugh so hard, you won't need to consider revenge. Just the idea will be enough.