點樣由英國打電話去美國ah????

To dial another country from the United Kingdom:
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first dial the Europe long distance code 00
then the country code (1 for the US and Canada, 39 for Italy)
then the area code and number
Country codes of other countries: US-1, Canada-1, United Kingdom-44, France-33, Germany-49, Spain-34, Switzerland-41

To dial the United Kingdom from the US and Canada:
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first dial the US long distance code 011
then the country code (44 for the United Kingdom)
then the area code (drop the leading zero)
then the number
For example, if the United Kingdom phone number is 07981-555555, dial as follows:
011-44-7981-897555

I guess u r using calling card..
From UK to USA
1) Call the calling card access no.
2) enter your pin for you card
3) to dial somewhere outside UK use
00 + country code + area code + phone no.
country code for USA is 1
area code + phone no. would be the 10 digits number that you are trying to reach.

From USA to UK
follow step 1 and 2
3) 001 + country code + phone no.
country code for UK is 44