Do you really want an answer to that question if you are trying to avoid spoilers for the movie? Right now, you don't know whether it is a spoiler or not. It is Scrodinger's spoiler. Why open the box and risk finding a dead cat?
Then you spend the whole movie obsessing about if it's true or not, making it even worse.
It is a whodunit. Those movies are designed for you to obsess over every detail to figure out who actually committed the murder. Just consider the suspects' phones as extra clues that could prove to be either vital in solving the crime or a complete red herring.
I guess my question was more rhetorical, a way to complain about having the movie spoiled for me. I had already concluded that the movie was spoiled.
If that is the case and you are willing to brave another potential spoiler... this movie is setup in a way this iPhone spoiler is a much smaller reveal than it would be in most other whodunits. I can't say more without serious potential spoilers, but you would know what I mean if you see the movie. I wouldn't let this iPhone detail decrease your desire to see the movie.
Because as a reader of Hacker News, I am driven by knowledge and information, even if it is to my detriment. My personal condition is irrelevant, the only thing that matters is The Knowledge.