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This paper presents a new development of mobile communication for application to remote data transmission and control. The concept of G3, including global positioning system, global system for mobile (GSM), and geographic information system, is proposed. In this paper, a GSM real-time control system for data uplink and downlink remote terminals is considered. The proposed system can be implemented on a PC-based or a μP-based to integrate into G3 configuration. This paper presents the system design and implementation with practical data verification. The proposed GSM real-time control system has accomplished a very reliable two-way point-to-point uplink and downlink data transmission within a 0.6-s time delay.