Check out this app, iRappU

iRappU is an innovative instant response mobile application that will automatically respond on your behalf, hands-free. It will connect you instantly with your friends, family or even your co-workers to give them an up-to-date response status whenever you are not available to respond to them immediately. This app will provide anyone trying to contact you with a peace-of-mind on your whereabouts when you are needed.

You will need to tell all your friends to install this app so you can stay connected. This app is very handy and can be used on a daily basis. Once you get used to it, you can't be without it. Save a Life, "Don't Text and Drive".

Go to Google Play - iRappU