The Knock Android app is sure to grab the attention of your friends, family or loved ones next time you send them a text message. That's because the Knock app simulates an incoming call every time you send a text message.
Knock is an app designed exclusively for Android users. Every time you send a message a fake call screen will appear on the receiver's phone. Rather than showcasing the traditional accept and reject call button functions, the Knock incoming call shows your text message written on the screen. Receivers can either hit a 'yes' or 'no' button in order to reply. The only catch is that the receiver also has to have the Knock app downloaded on their Android phone.