3G or the third-generation networks are more powerful cellular networks with transmission speeds ranging from 144 Kbps for mobile users in a car to more than 2 Mbps for stationary users.
This is sufficient transmission capacity for video, graphics, and other rich media, in addition to voice, making 3G networks suitable for wireless broadband Internet access.
People interested in high-speed Internet access, music downloads, and data transmission where 3G is unavailable are relying on an interim solution called 2.5G networks.
2.5G networks use upgrades to the existing cellular infrastructure and feature data transmission rates ranging from 60 to 354 Kbps.