I kinda like thinking that as much as reality altered to suit Ryojiās presence, such as making him able to go to school and no one question his presence it also affected Ryoji.
Like he lived for a MONTH with no memories, no contact with parents, presumably no place to stay, and I donāt think he even thought about having a phone until he realized he SHOULD have one, he only questioned it when someone else questioned it first(like Kyoto where we see him question school trips).
I like thinking that reality itself also altered his own perception of himself, making him think that things like this were normal, that heās just forgetful. He DOES have a phone its justā¦not with him at the moment. Or when he was supposed to be going home he actually just subconsciously disappeared like he did at the piano.
He just doesnāt think about that stuff until someone normal points it out and suddenly heās realizing it IS weird that he doesnāt know where he lives and that he should have his parents contact info on his phone.












