UMTS B9 (1800 MHz Japan)
UMTS B9 (1800 MHz Japan) is a frequency band used in Japan for UMTS (Universal Mobile Telecommunications System) networks. This band operates at a frequency of 1800 MHz and is specifically designated for use in Japan. It is one of the five UMTS bands used in Japan, along with B1 (2100 MHz), B8 (900 MHz), B11 (1500 MHz Lower), and B19 (800 MHz Japan).