Symbian didn't use X in any way. That was Maemo, used on the 770. But there were also some Symbian-based touch devices like the 5800 XpressMusic: https://en.wikipedia.org/wiki/Nokia_5800_XpressMusic

But Symbian didn't have any roots in Linux. It came from the Psion organiser line originally (and specifically the 5/7 series, not the earlier 3's).