What is Lotu Line Subscription Service? The Lotu Line is an IVR based service which reach out to practicing Christians who would want to be in touch with their spiritual side at all times through their phone. Related articles How does the Lotu Line service work? How do I subscribe to Lotu Line service? Who can use the Lotu Line service? What is the UBOOK subscription service? How does a SIM card becomes expire on Digicel’s Network?