Softbank 3G is 900, 1500, 2100
•3G: Also known as UMTS or W-CDMA, the basic data network technology in use today. Can reach speeds from 384kbps to 2mbps. Supported by Softbank's Platinum Band
•HSPA: Softbank calls this "3G High Speed", allows data download up to 14Mbps. Most modern phones support this as well as 3G
•HSPA+: Also know as "Evolved HSPA", Softbank is introducing this on the Platinum Band and also on the existing 2100MHz frequency band. Allows download speeds up to 21Mbps. Not too many phones support this.
•DC-HSPA: Softbank calls this "Ultra Speed", and it stands for "Dual Cell HSPA". It doubles the speeds of HSPA, allowing downloads up to 42Mbps. Uses the 1500MHz frequency band on Softbank. Again, few phones support this.
•LTE: "Softbank 4G", up to 110Mbps download in the 2.5GHz spectrum.