i think the biggest problem, with the phone is just it's extremely inconvenient, when going to a new place you have to click in the least 3 times to get out, and even then you might just waste your time going to a location with nothing on it.
i think what should be added is
1 some way to pass time, that i imagine will already be added considering we had it before, but this time we'll be able to do it with the phone.
2 something either like in game notes or a character screen that unlocks info when you hang out with a character and keeps that there so you know at what time and where this character is(or just the map itself has little icons of the characters when they can be talked to in a certain area, for you not to waste your time going to a place that's empty).
3 i do not know if this is possible with the current engine, but what if instead of the app taking the whole screen we can have multiple apps, with a determined size so it isn't that annoying to be constantly pressing buttons.(or honestly just making movement options be on the screen like the options of dialogue and just opening pats to then talk with people).
but i don't know if it's feasible so oh well.
just the phone right now is very annoying and buggy as fuck so i guess just fixing that is the main issue right now.