Calling any telephone or mobile number anywhere in the world directly from your local fixed line is easy, quick and reliable.
Just lift the handset, dial 00 followed by the code of the country you are calling, then by the city code (in many cases this code is already included in the number you have) and then the particular number you wish to dial.
Eg. To phone number 1234567 in London, UK, you would dial: 0044 208 1234567
Often a city code is given with a preceding zero (0). To dial some countries, you may need to remove this first zero from the city code.