/jp/ - Otaku Culture

Now to a serious question. Warning, it's a spoiler to ULiL ending.

Question:
How does Satori know what is phone? Yes, sometimes items from outside world appears in Gensokyo, but Palace of Earth Spirit is deep underground and far away from barrier. Besides even if Satori somehow found the phone she would not know how it's called. For her it would be just a strange rectangular item. I don't
She would need to meet a human who would tell her about his phone. And what are the chances some random person would be able to make that far underground?

Does Satori secretly visit outside world? Or does she lure people to her palace to give them sexual favours? I want Satori to give me a sexual favour too.