Great app, I was in the process of implementing this across my company but we found a few issues that are show stoppers for now. Messages that are to self delete need the option of deleting in say an hour, 2 hours, sensitive communications needs not be lingering around on someone's phone for excessive amounts of time. Also. When a conversation is deleted. It must delete on all devices that are privy to that conversation. Threema does solve a lot of communication issues. I can't wait for these fu