People who don't reply to your messages is undoubtedly infuriating, especially for parents who are trying to get in contact with their children. So, when one dad had decided enough was enough, he set out to solve the problem.
The solution he came up with was an app; specifically, a messaging app which hijacks the users phone until they respond to the message that they've been sent. The primary question which has arisen being, is this an app for concerned parents, or an invasion of privacy?