This sort of thing has been possible since at least 2010.
Back in 2010, I knew it was happening on my equipment, but I couldn’t prove it and when you say something like that out loud, everyone assumes that you’re delusional. After all, accepting that I might be correct is a scary thought.
Too scary for most people.
So when I finally got the proof, when I was able to compare a tweet on my phone with the same tweet on a friend’s computer, I could see that there were words in the tweet on my phone that were not present in the tweet on my friend’s computer… I didn’t show it to anyone. There was no point. Nobody was going to be interested.
The original tweet came from Portsmouth-based Maricar Jagger, but she had nothing to do with the digital mischief (other than that she was connected through her social circles).
I also knew about phone hacking via the invisible text message method before it became news – because I saw it happen on my own phone. (Same thing. Delusional cow who has difficulty grasping technology was the usual response.)
And OUT goes a big chunk of police “evidence”, of course.
(See also this page.)