General Packet Radio Service (GPRS) is a new service designed for digital cellular network (GSM, PCS, etc.). Due to its high efficiency on radio resource and "always on" mobility, GPRS has been widely adopted all over the world. So far, at least seven among the top 10 mobile operators have launched their GPRS services. Shanghai Mobile began its GPRS project in 1999. After well preparation, the Shanghai's commercial trial GPRS network was started in July 2001. During the trial, network performance has been carefully studied, so does customer behavior. By the end of 2001, GPRS network has fully covered Shanghai. In 17 May 2002, Shanghai Mobile announced to put its GPRS service into commercial use. In this paper, the development history of the cellular mobile communication in Shanghai is briefly reviewed first, and then the current GSM network status is offered. Further more, GPRS commercial trial is introduced. Finally some trial results are provided.