The results were mostly female, average age 27 years, a single study in an undergraduate. Job Student / Student / Student Total average monthly income of 17,017 baht and total cost 9,796 baht per month, most of the brands.Apple Average price 12,093 baht / period average usage two years, most of the callers using the AIS network using prepaid costs 628 baht / month for 7 hours / day and found that consumers with class. educational and professional differences. Influencing the purchase price, except for the different brands and mobile smart phones are different. Influence the selection of different aspects. While the network is different. Influencing Buying different, except for the product. And patterns of use vary. Influencing Buying different, except for the price and the supplier.