The purpose of this research is to study the advantages of 5G technological innovation in the development of smart cities, i.e., to find out in what way this technology plays the main driving force of other relevant technologies essential to developing smart cities. In addition, this study explores the potential consequences of developing smart cities using 5G technology. Main Research Question How does 5G technological innovation influence the development of smart cities?  Sub-Research Questions 1.1 What are the advantages of smart city development using 5G technology?  1.2 What are the hindrances to smart city development using 5G technology? The methodology of this study includes bibliometric data analysis and a systematic literature review. The journal databases have been searched with appropriate keywords to get published articles on 5G technological innovation, its advantages, and potential consequences on the development of smart cities, technological hindrances, and sustainability threats to the development of smart cities. The relevant literature was then analyzed precisely. In the development of smart cities, the 5G technological innovation is to act as the backbone of smart cities. There are different types of technologies contributing to the development of smart cities. Among them, the Internet of Things, Information and Communication Technology, Artificial Intelligence, Sensors, Geospatial Technology, Blockchain, Robotics, and Industry 4.0 are fundamental technologies. 5G technological innovations are strategic. Therefore, whether this innovation has a strategic impact has been found in this analysis.  Recommendations We must welcome and utilize the advantages of new technological innovation. We still need more practical studies of using 5G in smart cities. Telecom operators, relevant service providers, and vendors can collaborate with public health and environmental researchers to clearly disclose the 5G advantages and potential consequences.  Further research is required to finalize the unknown facts of EMF pollution, and other controversial areas like privacy, safety, and security could be studied to determine whether the 5G wireless technology is secure and adds real value for the users.