There are different band in different country but most of commonly used band we will discuss here.
Main bands : means basic band when 3G commercial launch by Private or public sector.
1920 ~ 1980MHz / 2110 ~ 2170MHz Supplementary bands: different country maybe different as per government selling in auction.
1850 ~ 1910 MHz / 1930 MHz ~ 1990 MHz (USA) 
1710 ~ 1785MHz / 1805 ~ 1880MHz (Japan) 
890 ~ 915MHz / 935 ~ 960MHz (Australia)
 
Frequency channel number : central frequency×5, for main band: 
UL frequency channel number :9612-9888 
DL frequency channel number : 10562-10838

The WCDMA system uses the following frequency spectrum (bands other than those specified by 3GPP may also be used): Uplink 1920 MHz ~ 1980 MHz and downlink 2110 MHz ~ 2170 MHz. Each carrier frequency has the 5M band and the duplex spacing is 190 MHz. In America, the used frequency spectrum is 1850 MHz ~ 1910 MHz in the uplink and 1930 MHz ~ 1990 MHz in the downlink and the duplex spacing is 80 MHz.