Do you need to retain that customer?

Most of the operators have rules to remove their prepaid customers from their customer base (ie.HLR) if the customer is not "active" for a couple of months(usually 6) They want the subscribers top-up or make at least one call so that they can be qualified as active.

But, wait a minute.. A subscriber can still be very profitable even he is not topping up a penny. The subscribers getting calls from other operators can generate a fair amount of revenue from the termination rates. Therefore, I totally disagree with this deactivating process of operators.

The retention and churn strategy should be bound with profitability, not activity.