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ＡＴ＆Ｔ已经在其实验中研究一种被称为第四代移动通信(4Ｇ)的技术,其研究目的是提高蜂窝电话和其他移动装置无线访问Ｉｎｔｅｒｎｅｔ的速率。目前,移动电话上网的连接速率大约为拨号调制解调器的四分之一,而采用4Ｇ技术的系统的连接速率一开始就能达到拨号调制解调器的90倍,
In its experiment, AT & T has studied a technology called fourth generation mobile communications (4G) that seeks to increase the rate at which cellular phones and other mobile devices can access the Internet wirelessly. Currently, the rate at which mobile phones connect to the Internet is about a quarter of that of dial-up modems, and that of 4G-based systems can reach 90 times the dial-up modem from the start,