Instructions for calling from the UK to international locations requires special calling codes that allow you to connect to countries outside of the United Kingdom.
Calling out to Guam
Here are the instructions on how to call the country of Canada from the United Kingdom.
To call Guam, dial 001 and then enter the phone number of the person or location you’re trying to reach. If the phone number is displayed with a leading +1 omit the 1 and replace it with the UK international dialing code of 00. For example:
Phone Number in Guam
Dialed from the United Kingdom
How to call the UK from Guam
To call a landline or mobile phone in the United Kingdon from Guam, dial 011 44, then dial the UK phone number, minus the leading zero. For example: