The successful integration of information systems (ISs) in any merger and acquisition (M&A) was crucial for achieving the expected synergies of the transaction. This case described the journey of the merger of two telecom giants in India, Vodafone India Limited and Idea Cellular Limited, into Vodafone Idea Limited (Vodafone Idea), India’s largest telecom services provider at the time of the merger in August 2018. The case invited students to understand the varied dilemmas that Vodafone Idea’s chief information officer faced in conducting large-scale application-integration exercises and making decisions that would have a long-term impact on the IS operating model for the merged entity.