The telecommunications industry is undergoing a profound transformation, driven by innovations in 5G networks and the growth of Internet of Things applications. To capitalize on these technologies, companies must effectively handle increasing volumes of unstructured data while developing modern applications that are flexible, high-performance, and scalable. However, traditional reliance on relational databases like PostgreSQL presents a challenge to modernization due to their rigid structures limiting adaptability and performance as table complexity grows. Leveraging MongoDB's document model can help telecom companies overcome these challenges by providing flexibility, scalability, and security. Key benefits include robust security measures, built-in Atlas services for advanced industry cases, and the ability to streamline applications such as single customer view, AI integrations, and real-time analytics. By selecting the right technology and establishing a comprehensive modernization strategy, organizations can successfully transform their legacy systems, improving operations and gaining a competitive edge with advanced technology.