I found recently that my android phone had automatically front-run SMS messaging with some kind of google based imessage like wrapper. The only "feature" this provided to me (I'm sure it let google harvest my conversations) was that suddenly my SMS discussion had an "is typing" indicator which is how I knew it had been changed, and was literally the last thing I would want in a discussion. Thankfully I can turn it off so presumably google only steals my information in the background