Once SMS is turned on you get a message on top of the screen informing you what identity will be used, can't seem to find a screen shot of that (probably since people don ' way to publicise that info).
Part of the problem is the lousy quality of journalism. From reading TFA we can't know what actually happened. But if you know what happens on simillarly installed OSs and accounts it'd be great if you could present a clear wallthrough.
At the moment you seem to be making irrelevant points.