The study estimated the elasticity of domestic telecommunication demand in South Korea from 2003 to 2015 using household survey data. They found that food, housing, and telecommunication are all essential goods with positive income elasticity, meaning demand increases with income. Additionally, the price elasticity of telecommunication is less than 1, indicating that price changes have a less than proportional effect on demand. This suggests that new services like 5G and foldable phones could impact overall demand.