Before iMessage and Hangouts there was Meego which was an attempt to bring back the chat applications on smart phones with an XMPP client, but the protocols wer

Before iMessage and Hangouts there was Meego which was an attempt to bring back the chat applications on smart phones with an XMPP client, but the protocols weren't good enough (and the app wasn't very good either). Without mobile first considerations you'd lose history or miss messages on the phone making it pretty unreliable. When anything else came along that was better it was used instead. Any network advantage XMPP had quickly died as people moved on to things that actually worked (most of which were walled gardens).