The IET Wireless Symposium 2025 is organized by the Electronics and Communications Section (ECS) of IET Hong Kong. The theme of the symposium is "Wireless Horizon: Innovations in Smart City through AI and mobility". The Symposium discusses the latest development on sustainable and connected smart city including but not limited to Standards, AI, robotics, blockchain, healthcare, cyber security, product safety, logistics, transportation, UAV, digital twins, smart metering, mobile communication infra-structure and IoT applications and challenges. Focus will be around Hong Kong and the Greater Bay Area.