I don't understand what Google have done with this app. I can't now choose to send a text from my (unlimited) allowance - if the other person also has Messages, it has to go as a Chat using my mobile data allowance (which is limited). If the other person has Chat features disabled or is offline the message never arrives. If they wanted to compete with WhatsApp it should have been a separate app. This thing is too big and complicated. I am going to replace it with something much simpler.