What is the difference between one-way and two-way kt versions?

The difference between single-pass and dual-pass kt versions lies in the supported network frequency bands. One-way kt mobile phone only supports a certain frequency band in kt network, and users can only use this frequency band to communicate, while two-way KT mobile phone supports two frequency bands, which can communicate in two different frequency bands on KT network, which is equivalent to wider network compatibility. One-way and two-way kt versions refer to the network standards supported by mobile phones, where kt refers to Korean network operator kt. It should be noted that due to the different network standards and frequency bands in different regions, the use scope of one-way and two-way kt versions of mobile phones will be different. Before buying, please confirm the local network frequency band support and choose the appropriate mobile phone model.