In mobile telephony, 2.5G protocols extend 2G systems to provide additional features such as packet-switched connection (GPRS) and enhanced data rates (HSCSD, EDGE).

• 在移动电话技术中，2.；5G协议将2G系统扩展到提供诸如分组交换连接(GPRS)的附加功能和更高的数据传输速率(HSCSD、EDGE)。