You should probably make it a little bigger. It will be wrong in term of proportions, but better in term of user interface. That's why sometimes usual objects seem weird in games, because the size reduction implied some change in the proportions.
You perhaps also should think of a way to force the player to take the phone, since it's the only way to save/load the game. Don't know, something like:
When the game starts, in the garage, MC say to himself, "Eh, what time is it ? Oops, I forgot my phone in my room, I need to go take it before anything else".
Not only it will focus the attention of the player on the phone, but it will also introduce the fact that he can interact with some objects to take them, and that he need to search for them. After all, not everyone was raise with Lucasart/Sierra games
All this said, I like where the game goes. Except the flash each time the screen is updated, the new design is easier to understand. Talking about it, you should probably do a quick update just to get ride of the said flash. It's a killing thing for epileptics.