NTT DoCoMo experimented with new prototype phones in Japan that can view 32 high definition vide streams, while travelling in an automobile at 20 kilometers per hour. While moving the phones could receive data at 100Mbps (12.5MB/s) and while static this jumps to an impressive gigabit per second (125MB/s).
The technology behind NTT DoCoMo's high-speed phone network remains experimental, but the 4G tests used a method called Variable-Spreading-Factor Spread Orthogonal Frequency Division Multiplexing (VSF-Spread OFDM), which increases downlink speeds by using multiple radio frequencies to send the same data stream.
Read on at NewScientist to learn more about 4G. NTT DoCoMo hopes to make a 4G commercially available by 2010.