Carrier question: KT Olleh

I know its far fetched, but I'm trying to determine if there is a way to forward all calls and SMS/MMS from my LG on KT Olleh to my unlocked Nexus 6 also with KT Olleh? I'm really growing tired of carrying around two devices. I'd consider a dual sim device but love my Nexus 6 dearly and would rather use it.

Note: simply trying call forwarding from the android menus gives me an error.