Contact Owner — Open Source Contacts App

Contact Owner is displays your (or a friend's) contact information on the "lock screen" of your device, so that if you happen to lose it the finder will know how to contact you. Select yourself (or your friend) from your list of contacts, then select which information you want shown and (optionally) customize your message. Contact Owner is a "fire and forget" tool: once you set it up, your contact information will keep being displayed even after restarting your device, as long as the application is installed.