abstract:A subgiant star is a star that is slightly brighter than a normal main-sequence (dwarf) star of the same spectral class, but not as bright as true giant stars. Although certain subgiants appear to be simply unusually bright metal-rich hydrogen-fusing stars (in the same way subdwarfs are unusually dim metal-poor hydrogen-fusing stars), they are generally believed to be stars that are ceasing or have already ceased fusing hydrogen in their cores.
In just one year, Softbank managed to boost the subscriber base of the challenger carrier from 700, 000 in fiscal 2006 to 2.7 million in fiscal 2007, vaulting ahead of its giant rivals NTT-DoCoMo and KDDI in sub additions.