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With the growth of competition in the telecommunication market, optional calling plans were introduced in 1980s, have expanded dramatically in 1990s and now have become widespread rate systems in many countries. In this respect, the Korean telephone market also provided various rates. Compared to other countries, however, a special optional calling plan has activated in Korean market. It is a unique calling plan where rates are based on previous calls made. That plan provides high marketdoi:10.4236/me.2011.25101 fatcat:t4mi72m36vdwvgbmnkvztgky4u