UK Area Code Finder
Quick and easy telephone dialling code information
Guam uses country code +1, followed by area code 671.
From the United Kingdom you need to dial:
then the seven-digit local number
Dialled from the UK as: 00 1 671 555 0012
Sometimes, the number you want to call may already be written out including the area code and/or +1 country code. For example:
In such cases, just make sure the last seven digits (the local number) are prefixed with 00 1 671. All the examples above would be dialled from the UK as: 00 1 671 555 0012.
To call a United Kingdom landline or mobile phone from Guam, dial 011 44, then the UK number without its leading zero.
For example, the UK number