I found a nice site with an easy to use way to help you dial another country. Since I am currently in China and I call both the USA and India, here’s some examples from http://www.simplecountrycodes.com/
TO
FROM
Dial:
China
India
00 + 86 + area code + phone number
China
USA
011 + 86 + area code + phone number
India
China
00 + 91 + [...]