To call an office or residence on Kadena from the United States, simply dial 011-81-6117-XX-XXXX, replacing the Xs with the last six digits of the DSN telephone number.
To call on base from off base, people must first access the base switchboard. There are two ways to do this. One way is to dial the Kadena base operator at 938-1111, wait for a dial tone, then dial the number you wish to reach, 632/3/4-XXXX. If you don't know the on-base phone number, dial 938-1111 and wait for the operator to assist you.
Base-to-base calls: Just dial the seven-digit phone number. If you need operator information, dial 113 for Kadena.
Source: Kadena AFB Website