https://surakaraali.pages.dev/en/blog Şura Karaali’s notes: what I learn from projects, and what I’ve been reading about. en https://surakaraali.pages.dev/en/blog/telco-churn https://surakaraali.pages.dev/en/blog/telco-churn Fri, 30 Oct 2026 09:00:00 GMT I looked at 7,043 customers of a telecom company and asked three questions: who are we losing, what does it cost, and what should we do about it? The short answer: most of the loss comes from one small group.