Area codes in the United States typically follow the North American Numbering Plan (NANP) and are structured with three digits. However, there is no area code 156 in the U.S. or in the NANP.
If you’re referring to a phone number or code that seems similar, double-check the digits, as it might be a different area code or part of an international dialing code. Let me know if you need help with a specific number!
