KDDI Carrier From
Japan

The KDDI au Carrier From Japan is denoted by codes: 440 50, 440 51, 440 52, 440 53, 440 54, 440 70, 440 71, 440 72, 440 73, 440 74, 440 75, 440 76, 440 78. The followings IDs are called HNI (Home network identity). This code is created by the combination of two other Mobile Country Code (MCC) and Mobile Network Code (MNC). The first three numbers stand for the MCC and they are used in order to identify the region which the carried comes from (in the following example it’s Japan). The last numbers of the HNI code are equal with the MNC and this ID is given for the specific mobile network operator.

Besides KDDI au Japan has assigned country code + 81. This number + 81 is equal with international calling code and it’s simply the telephone dialing prefixes used for calling KDDI au numbers.
KDDI au uses 0 GSM bands, 0 UMTS bands, 7 and 0 CDMA bands.. You can read the specific frequency bands in the table below. All bands of the KDDI au are display in MHz units.
Another important information in KDDI au Japan architectures is the standard of used protocols. It also uses 3 protocols such as GSM, UMTS, LTE, CDMA. The ISO standard code of KDDI au is JP. You can see more info about this mobile network operator at https://www.au.com/. How to check KDDI au coverage? How to check if your phone will work in Japan?