Kings Quest, Police Quest, Space Quest - these were the first experiences that really fascinated me with computers. The exploratory conversational aspect of the text based interface is still compelling to me. I’d love to see all these games on phones - I think they’d work well.
I played a port of PQ1 on a Nokia N95. Sadly it didn't work well, between the small screen, the wrong aspect ratio and the 12 key pad. Perhaps a larger touchscreen might ameliorate some of these problems but I generally find text entry on newer phones much worse with my (large) fingers.