How do you dial a telephone call from Ireland to London?

The international telephone country code for North America, including the USA, Canada, and certain island territories and countries, is +1, followed by a three-digit area code and a 7-digit subscriber number. The length of the number should always be exactly 10 digits after country code +1. There are multiple area codes for different locations in North Carolina, including some areas that have more than one area code serving the same communities, so you need to know the area code and number for the person you are calling.

If you are calling from a mobile phone, just enter the number in international format, beginning with the plus symbol. If you are calling from a landline, substitute the prefix 00 for the plus symbol.