1. 第二代(2G)：
2G 移动网络基于 GSM(全球移动通信系统)。该技术于 1991 年在芬兰开发。消息在该技术中被加密。该技术中使用的数字信号使用更少的电池，因此功耗更低。还为手机提供数据服务。高级版是2.5G和2.75G。
2. 第三代(3G)：
3G 移动网络于 2001 年在日本开发，以达到 2G 技术所缺乏的速度高度。该技术的标准由国际电信联盟(ITU)制定。该技术为用户提供GPS(全球定位系统)、视频会议和移动电视等服务。
2G和3G蜂窝网络的区别：
| 2G | 3G |
|---|---|
| Network construction and maintenance is cheaper. | Network construction and maintenance is costlier. License fee to be paid for 3G is also higher as compared to 2G. |
| It provides slower download speed and slower access to applications. | Faster access and download speed for applications. |
| 2G is less compatible with the functions of smart phones. Data transmission rate can be of 50, 000 bits per sec. | 3G is widely used for smart phones. Data transmission rate can be more than 4 million bits per sec. |
| It is less secure than 3G. | Highly secure as 3G network permits validation measures. |
| Video calls cannot be made. | Video calls can be made. |
| Downloading and uploading speed is upto 236 kbps. | Downloading speed is upto 21 Mbps and uploading speed is upto 5 Mbps. |