The app allows video-chat conversations between any combo of iPhone and Android phones. Plus it has an interesting feature called Knock Knock. When you are calling someone who has the app ...

You can leave (or at least silence) any conversation whether it's using Apple's iMessage, RCS or plan-old MMS.

Whether you're an iPhone owner and everyone in your group is texting from an Apple device, or you're on team Android chatting with other Android users over RCS, your conversations have typing ...