United States country code

As many North American countries, the international dialing code 1 is only required to call United States from abroad. Concerning national calls made in United States, it is not necessary to dial the American country code 1. Finally, to call your correspondent in United States from a country abroad, dial first the prefix of exit which takes one of the following forms: 00 / 011 / 810 and sign "+ " for calls since the mobile phone. These are possible compositions: 001 / 810 1 / 011 1 / +1.

• International access code (exit code) : 011 (to dial when making calls from United States to abroad)
• American international dialing code : 1
• Fixed telephone Subscriptions (2016) : 121 530 000 American subscribers
• Mobile landline usage : 37.72% of Americans
• Mobile cellular users (2016) : 395 881 000 American mobile users
• Mobile phone usage : 122.88% of Americans
• Internet usage : 76.1% of Americans