The United States is part of the North American Numbering Plan (NANP), which is telephone country code +1.
The international access prefix for outbound international calls from North America is 011.
The international access prefix for inbound calls to North America depends on where the caller is located.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The country code for France is always 33. You have to prefix the country code with the International access code, which varies from country to country.The preferred international access code is 00, but from the US and Canada it's 011. To avoid confusion, when publishing an international number the plus (+) symbol is used to represent the international access code.
To dial out of the US, first dial the international access code (usually 011), then the country code of the country you are calling, followed by the area code and phone number.
To dial out of the US, first dial the international access code (usually 011), then the country code of the country you are calling, followed by the area code and phone number.
To dial outside the US, first dial the international access code (usually "011" in the US), then the country code of the country you are calling, followed by the local phone number.
To dial China from the US, first dial the international access code (011), then the country code for China (86), followed by the area code and phone number.
To dial China from the US, first dial the international access code (011), then the country code for China (86), followed by the area code and phone number.
International country code for South Korea is +82. Replace + with 011 if calling from US/Canada Replace + with 00 if calling from Europe.
To call China from the US, dial the international access code (011), followed by the country code for China (86), and then the area code and phone number you wish to reach.
To call China from the US, dial the international access code (011), followed by China's country code (86), then the area code and phone number you wish to reach.
To call Singapore from the US, dial the international access code (011), followed by the country code for Singapore (65), and then the phone number you wish to reach.
To call Singapore from the US, dial the international access code (011), followed by Singapore's country code (65), and then the local phone number in Singapore.
The '00' is a commonly used international access prefix, not part of the area code. Many other countries use different international access prefixes, such as 011 in the US and Canada or 0011 in Australia. Country code +56 is Chile, in South America. Area code +56 32 is Valparaiso.