Compatible with iOS 4, 5 and 6
You may purchase a license (Paypal)
FindMyPhone will let you locate your iPhone by sending it SMS. When FindMyPhone receives the saved SMS message, it will play your saved sound for the duration you selected. Enter SMS text that you can remember. For example use your home phone number, or your date of birth. You can also select a specific sound from the list and set the duration for the sound to be played.
See further below for Screenshots