Why was the ``call charge price cut'' for cheap SIMs realized in 2021 Looking back on the history of voice calls

Partially modified and excerpted from the 4th Report of the Study Group on Calculation of Connection Charges. Changes in connection fees, which indicate the costs of MNOs, were greatly reduced in 2010 due to system revisions (excluding operating costs from costs). The decline since 2011 has been more moderate, but the downward trend still continues.

History of Voice Calls and Regulations Surrounding "Connections"

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