3G – i.e., an entirely packet switched network with all digital network elements and extremely high available bandwidth.
For the most part, it is believed that 4G will bring true multimedia capabilities such as high-speed data access and videoconferencing to the handset.
It is also envisioned that 4G systems will be deployedwith software defined radios, allowing the equipment to be upgraded to new protocols and services via software upgrades.
4G also holds the promise of worldwide roamingusing a single handheld device.