Area codes in the United States typically consist of three digits, such as XXX, and are used to geographically identify regions within the country. Therefore, 156 does not fit within the standard U.S. area code system. U.S. area codes typically range from 201 to 988, with some exceptions, but 156 is not a valid code.
If you’re referring to a different system, such as country codes, 156 is the country code for China. Each country or region has its own unique country code used for international dialing. For example, dialing a phone number in China would begin with +86, where 86 is China’s country code, and 156 is used for mobile networks within China.
If you’re looking for a U.S.-specific area code or mobile network code, it’s best to check within the standard three-digit U.S. area code range, like 201 for New Jersey or 212 for New York City.
