How is the quality of the affordable phone?

I'm trying to change my phone, but I have a phone that I've been using, so I thought I could sign up with a thrifty phone.

It's just cheap, so I don't know what the quality of the call is.

How is the quality of the call compared to SK, KT, and U+?

1065 2015-09-22 Gentleman

I understand that the quality of the call is the same because it is a line rental method.

Gentleman 9 years ago 0

I'm using the SK network for the smartphone
KT's thrift phone uses KT's network.
There is no difference in the quality of the call.

Gentleman 9 years ago 0

The quality of the customer service center is a little different than the quality of the call

Gentleman 9 years ago 0