This document discusses churn management strategies for prepaid mobile customers in Portugal. It provides an overview of the Portuguese mobile market and describes various methodologies to reduce churn, including handset upgrade programs, loyalty programs that provide incentives for customers to stay with the provider, and retention programs focused on high-value customers. The key lessons are that operators must understand the main reasons customers churn and that implementing diverse loyalty programs makes it less attractive for customers to switch providers since they would lose benefits.