The document presents the findings of a market research study on post-paid mobile customers in tri-city Chandigarh, Mohali, and Panchkula. The study aimed to understand customers' purchase behavior, impact of advertising, needs and preferences. 300 post-paid customers of Airtel, Idea and Vodafone were surveyed. Key findings were that network coverage and plans influence choice, and Airtel is preferred for coverage and customer service while Idea offers cheaper plans. The document outlines recommendations for Airtel based on the research.