Area code 123 is not assigned within the North American Numbering Plan (NANP), which includes the United States, Canada, and several other countries. In the NANP, area codes cannot begin with the digit ‘1’.
However, in Japan, the area code (0)123 is used for Chitose in the Hokkaido region.
Source: Answers
It’s important to note that caller ID spoofing can display misleading area codes. If you receive an unexpected call from an unfamiliar area code, exercise caution, as it might be an attempt to deceive or scam.
