What are the steps for calling London from the United States?

To call London from the USA, dial the international line, United Kingdom country code, London area code, and finally the telephone number of the person you are calling. This information applies to all USA phone numbers trying to reach a London number, even if you are dialing from within the area.

1. Dial the international line

   Dial the code for calling outside the USA, which is "011."

2. Dial the U.K. country code

   London is in England, which is a part of the U.K. Therefore, dial the country code of the U.K., which is "44."

3. Dial London area code

   Dial the area code for London, which is "20." Some telephone directories list it as "020", but you only need to include the "0" if you dial out from within the U.K.

4. Dial the phone number

   Dial the telephone number of the person you are calling, it should be six or seven digits, use it as it is without any modification.