This document provides a summary of Bhanu Sharma's summer internship project at TATA TELESERVICES LIMITED studying customer usage and retention strategies at T24. It includes an acknowledgements section, executive summary, introduction on the telecom industry in India, objectives of the study, literature review, and details of the internship experience and learnings. The internship focused on analyzing customer usage patterns, retention strategies, and marketing practices at T24, a joint venture between Tata Teleservices and Future Group operating in 18 circles across India.