A leading telecom operator with over 60 million subscribers was haemorrhaging users — 8 million monthly active users had churned over 18 months. The existing app had grown organically over years without a coherent design vision: navigation was fractured, offers were buried, and a one-size-fits-all UI failed the operator's linguistically diverse base. Customer satisfaction scores were sliding and revenue-driving features — top-ups, bundle upgrades, exclusive offers — were going unseen.