Do I have to pay more to use the HD voice for KT?

A. 1

http://product.olleh.com/wDic/productDetail.do?Ite...
Looking at the link above, I don't think there's an additional charge.

Gentleman 8 years ago 0

OK

A. 2

Usually, they call on 3G, but in the case of HD voice, they simply call on LTE.
So you don't have to sign up separately and it doesn't cost data.

Gentleman 8 years ago 0

OK