This article presents a systematic review of scientific literature on Sigfox technology and its role within the Internet of Things (IoT) ecosystem, emphasizing its relevance to the Ecuadorian context. Using the PRISMA framework, 82 studies published between 2021 and 2025 were analyzed to identify key trends, applications, limitations, and practical insights. The findings reveal a growing global interest in Sigfox, with a publication peak between 2021 and 2023. In Ecuador, research activity has been notable, although network coverage remains limited and reliant on external infrastructure. Major application domains include agriculture, healthcare, environmental monitoring, and infrastructure management, particularly where low power consumption and rural deployment feasibility are crucial. Despite these advantages, challenges persist—such as restricted data throughput, dependence on proprietary back-end systems, and the need for enhanced cybersecurity. The study concludes by proposing technical recommendations to strengthen Sigfox implementation in Ecuador, leveraging both international best practices and local operational conditions.