International direct dialing means that you dial the entire number yourself, rather than calling an operator and asking her or him to dial it for you.
The U.S. shares country code +1 with Canada, Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, CNMI (Saipan and Tinian), Bermuda, Bahamas, Anguilla, Antigua & Barbuda, Jamaica, Cayman Islands, Dominica, Dominican Republic, Trinidad & Tobago, Grenada, Barbados, St. Kitts & Nevis, St. Lucia, St. Vincent & the Grenadines, Montserrat, British Virgin Islands, Turks & Caicos Islands, and the Dutch half of Sint Maarten. Those locations are dialed "one-plus" just like domestic calls.
For other international calls, dial:
011 = international prefix from the U.S. and Canada
country code (e.g., +44 for the UK)
city code (in most cases, drop the leading '0')
local number
# (the # key on your touch-tone phone tells the phone switch that you've finished dialing, so it doesn't wait to see if there are any more digits coming)
IDD means international direct dial.
Dial Direct offers many different services. Dial Direct allows a person to make a long distance call by simply hitting, 1, before the number, or, 001, before an international long distance call.
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 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 from the US to Australia, you need to first dial the international dialing code, which is 011. Then, dial the country code for Australia, which is 61. Finally, dial the area code and phone number you wish to reach in Australia.
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 Singapore from the US, first dial the international access code (011), then the country code for Singapore (65), followed by the local phone number in Singapore.
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 outside of the US, you typically need to dial the international dialing code (usually "011"), followed by the country code of the country you are calling, and then the local phone number.
To dial Australia from the US, you need to dial the international dialing code 011, followed by the country code for Australia which is 61, and then the Australian phone number you wish to reach.
To dial out to Australia from the US, you need to first dial the international dialing code "011" followed by the country code for Australia which is "61." Then, dial the area code and phone number you wish to reach in Australia.