In the ever-evolving landscape of the telecommunications industry, customer retention has become a paramount concern for service providers. As the market becomes more saturated and competitive, companies are exploring innovative strategies to maintain their customer base. Two such strategies that have gained significant traction are the implementation of Telecom Billing OSS (Operations Support Systems) systems and the outsourcing of customer retention efforts. These approaches, though distinct, can complement each other to create a robust ecosystem that enhances customer satisfaction and loyalty.