Lost Offline Pro also allows you to make it ring even if it was silent! In Addition, you can lock it with a password and even erase all your data from it!
Use any phone and send SMS to your lost phone containing one of the following (without + signs) :
For location: YOUR_CODE + location
For ringing: YOUR_CODE + ring
For locking: YOUR_CODE + lock + NEW_PASSWORD
For Erasing: YOUR_CODE + erase