iOS & Android: Nifty app that helps you keep the latest contact information on the people in your address book with minimal to no effort. Free for both platforms.
As long as a person has been linked to you through this app, any changes they make to their contact details will be pushed to your phone. Add a contact and forget about it - no more "is your number still..."
Give it a try, worth it.
It's also available for businesses, so you can instantly update your contact number and push it to clients in case of cable theft or any other lovely event that leaves you unreachable.+Whitson Gordon +Android Police
Useful little thing - if you have the time, go have a look.