# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Global System for Mobile Communications (GSM) | 全球移动通讯系统 (GSM)

GSM is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation digital cellular networks used by mobile devices such as mobile phones.

GSM是由欧洲电信标准协会开发的标准，用于描述移动设备（如移动电话）使用的第二代数字蜂窝网络的协议


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