South Korean telecom regulator KCC has ordered the nation's mobile operators to reduce service charges by November.
The KCC has told carriers to lower charges including subscription fees, wireless-data rates and bundled-product costs, media reports said.
But the move could hurt South Korea's three mobile operators, which are already struggling with slim profit margins, largely because of their high marketing cost.
SK Telecom has agreed to cut its subscription fees 27%, its wireless data rate 19% and replace its ten-second pulse system with one-second billing. KT will cut its subscription charges 20% and its wireless data rate by up to 62%, while LG telecom will reduce its voice rates by up to 25%.