The international telecommunications dialing code for the United States is +1. This code is used when dialing a phone number within the U.S. from other countries, and it allows international phone calls to connect properly. The "+ (plus sign)" indicates that it is a country code, followed by the specific number for the United States. The North American Numbering Plan (NANP) is the broader system in which this code operates, encompassing not just the U.S., but also Canada and several other Caribbean nations, allowing for a uniform dialing structure across these regions.