Its a great start!

Very useful, but may I suggest one more option? The ability to choose in putting the message "Reward and Good Karma, if found" on the screen under the buttons. It can be an option to turn the message on or off, or alternate messages... (the ability to create your own unique text about what youll do for the person who finds it, or additional instructions to help get the phone back in your hands, etc... Theres a lot of possibility here.

jjcmontana about Find My Phone