The Internet of Things (IoT) is a rapidly growing technology that connects billions of devices, generating significant energy consumption. However, this energy consumption is a significant concern for the environment. Green IoT aims to reduce this energy consumption by incorporating strategies such as designing energy-efficient data centers, transmitting data from sensors, and implementing energy-efficient policies. These strategies can help create a sustainable environment for IoT devices. A case study of smartphones is provided to illustrate the importance of adopting green IoT practices. By focusing on energy-efficient data centers, data transmission, and policies, IoT devices can contribute to a more sustainable and environmentally friendly future