How to make an international phone call

Example, call from Malaysia to USA

00 + 1 +

Area Code

+ Tel #

00 = Country exit code
1 =  Country code which is USA

Reference:
Call from  Malaysia to United States
http://www.countrycodes.com/search_usa.php?t=250&f=146

Country Codes for International Calling & Area Codes
http://www.countrycodes.com/