mobotalks : How to Reply to Messages While You're Busy with SMS Replier for Android?
Do you ever miss calls from people while you don't have access to your phone?
Don't you wish that in those situations, you could let those people know why you're currently unreachable and when they'll be able to reach you?
In such cases, it’d be nice to send an automatic text to those people to tell them why you didn’t answer. There is now an app for that.