What's Korean FMC ? FMS ?

What's Korean FMC ? FMS ? 

FMC is an abbreviation for "Fixed Mobile Convergence" of KT
and FMS is stand for "Fixed Mobile Substitution" of SKT.
They are not free calls on the internet.

Korean will make use cell-phone as a internet call service or at internet call service cost.

The user of KT'S FMC(Fixed Mobile Convergence) will has 2 phone number, `010-xxx~~~' & `070-xxx~~~'
And he will can change & use internet call service in Wi-Fi area.

SKT FMS(Fixed Mobile Substitution) is a concept that transfer fixed phone to wi-fi mobile phone Wi-Fi range on the other hand.

There are a lot of views that they are not a new service, they are charge fee table of Telecommunication companies.
Some people anticipate that the merging of "FMC+FMS" will come out.