We examinethedifference oftelecommunication marketbetween developed countries anddeveloping countries by usingadopter categorization whichdivides consumers intofive categories: Innovators, earlyadopters, earlymajority, late majority andlaggard. The results indicate thatthesizeof innovators indeveloping countries issmaller thanthatin developed countries; onthecontrary, thesize ofearly adopters in developing countries islarger thanthatindeveloped countries. The timeinterval ofearlymajority and latemajority in developing countries issmaller thanthatindeveloped countries. The analysis suggests thatthestrategy ofMNCs needto dynamically changewhenadopter category entersintoa new phasealong thenewproduct diffusion life cycle. IndexTerms-Adopter categories, BassModel,Developed Countries, Developing Countries