+1 explained
The Guam country code, 1, is what you dial before a Guam number when you call from abroad. It is also known as the Guam dialing code, Guam calling code, or Guam phone code. In the Guam phone number format, +1 comes first, then the area code and the local number.
- Country code
- +1
- The 001 country code is the same number
- ISO country codes
- GU, GUM
- Use the GU country code or the GUM country code on forms and passports. To call Guam, dial +1
- Used in
- Guam
- Also on +1: Antigua and Barbuda, Anguilla, American Samoa, Barbados, Bermuda, Bahamas, Canada, Dominica, Dominican Republic, Grenada, Jamaica, St Kitts and Nevis, Cayman Islands, St Lucia, Northern Mariana Islands, Montserrat, Puerto Rico, Sint Maarten, Turks and Caicos, Trinidad and Tobago, United States, St Vincent, British Virgin Islands, and US Virgin Islands
- Exit code
- 00
- From most countries. Also 011 from United States and Canada, 0011 from Australia, and + from any mobile
- Trunk prefix
- None
- Keep every digit after +1
- Number length
- 10 digits
- After +1
- Time now in Guam
- Guam mobile number format
- (671) 300-1234
- From abroad: +1 671 300 1234
- Guam landline number format
- (671) 555-0123
- From abroad: +1 671 555 0123
Guam phone number types
The first digits of a Guam number tell you what kind of number it is: a landline, a mobile, a free number, or one that costs more to call. Here is a sample of each type of Guam phone number, as dialed inside Guam and from abroad.
Good to know before you call Guam
“Håfa adai”
It means hello. No source confirms a special way people in Guam answer the phone, so this is the common Chamorro greeting
Emergency number
911
There is no separate number for police, an ambulance, or the fire department
Guam Police DepartmentGuam joined the North American Numbering Plan on 1 July 1997. Before that, US callers dialed 011-671 to reach Guam, as if calling abroad.
Wikipedia: Telephone numbers in GuamNational toll-free codes such as 800 and 888 did not work from Guam until the FCC opened them to the island in April 2015.
Wikipedia: Telephone numbers in GuamGuam has dialed every call with all ten digits since 24 October 2021, even though 671 is its only area code.
Wikipedia: Telephone numbers in Guam
What it costs to call Guam (using Suparelay)
Landline from $0.09/min
Only 23 of 221 countries cost less to call than Guam.
Enter a numberEach bar counts the countries at that price
Want to call Guam?
Call any phone from this tab. Nothing to install on either side, and you pay cents a minute.
Why a call to Guam fails
You call from: 🇦🇺 Australia
Guam has no country code of its own
Guam shares +1 with the US, Canada, and other places nearby. From outside North America, dial your own exit code, then 1 671 and the number.
- Connects
- 0011 1 671 555 0123
- Does not connect
- 00 1 671 555 0123
The toll-free number is not Guam-specific
Guam's toll-free numbers start with 8, the same national US codes as 800 and 888. Dial the direct +1 671 number if one does not connect.
- Connects
- 0011 1 671 555 0123
- Does not connect
- 0011 1 800 212 3456
Questions about +1
What is the country code for Guam?
Guam uses +1, the same country code as the US and Canada. Its own area code is 671.
How do I dial Guam from abroad?
Dial your exit code, then 1 671 and the seven-digit number. From the US or Canada, dial 1-671 directly, with no exit code.
Can I text a Guam number?
Yes. A Guam number takes a text the same way as any other +1 671 mobile number, at your carrier's rate.
How much does it cost to call Guam?
The dialer on this page shows the exact price of the number you enter before you call.
Is there a trunk prefix to drop when calling Guam?
No. Guam numbers have no trunk prefix. Dial +1 671 and the seven-digit number in full.
The information on this page is accurate as of September 26, 2026.
Wikipedia: Telephone numbers in Guam