The increasing importance of the mobile phone of the people is promoting new marketing research. India is one of the fastest growing economies in the world and the fastest growing mobile phone industry in the world, as a result, where we had only a limited number of mobile phone options a few years ago, today we have a lot of mobile phones option. In particular, customer behavior in mobile phone market, from adoption motivation to post usage behavior has become a major focus of research in the field of consumer purchase behavior in the Faizabad city. The mobile phone has become an essential part of the life of the people, without which it is a blank dream to imagine development in today's digital era. Indian government is also promoting the “digital India” and it is a major fact that without mobile phone we cannot imagine about digital India. Asit is known, the income of the people in India is constantly increasing and there has been an august shift in the attitude and aspiration of the consumers. Our objective of this research is to analyze those external and internal factors that influence the decision of buying the mobile phones of the people of Faizabad city. Our research also affects the consumer's approach to the mobile phone and the name of the brand. Our research is dependent on quantitative analysis in which we have know the opinion of 200 people of Faizabad through our digital questionnaire and we also found in our research that the trend of purchase of phones in customers of Faizabad is very high on ecommerce companies as those companies provide better options in the right cost and the first choice of customers in the mobile phone is the Redmi (MI) brand.