Guam country code
+1 671 is the country code of Guam. From the US, dial 1 671 300 1234; from a mobile phone, dial +1 671 300 1234.
See mobile and landline prices
How to dial Guam
Dial the exit code of the country you are calling from, then 1 without the plus sign, then the local number. Exit codes from ten large calling countries:
The example is a mobile number in Guam, written locally as (671) 300-1234. There's no leading digit to leave out: dial the full local number after the country code.
Time in Guam and the best time to call
Guam is on UTC+10. Compared with New York its clock is +15 h, with London +10 h and with Dubai +6 h (today's offsets, daylight saving included).
Guam does not change its clocks for daylight saving, so the offset stays UTC+10 all year.
Business hours in Guam run 09:00–18:00 local time on working days. On other clocks that is:
The weekend in Guam is Saturday and Sunday.
How numbers in Guam are built
A number in Guam is the country code +1 followed by a national number of 10 digits. The trunk prefix, where there is one, is dropped after the code.
Written locally as (671) 300-1234, an example mobile number in Guam is dialed as +1 671 300 1234 from abroad.
To call out of Guam, dial 011, then the other country's code and number. On a mobile phone you can type + instead of 011.
Call Guam with QuikRing
Right from your browser, no app or SIM card. Charged per started minute, with no connection fee.
Prices checked October 30, 2026.
Countries that share +1
Guam shares +1 with the countries and territories below. The digits after the code, not the code itself, show which one a number belongs to. Numbers in Guam start with +1 671.
A call or message from +1 671 you don't recognize
The country code shows which country's numbering plan a number is registered in. It doesn't show who is calling, and caller IDs can be spoofed, so a +1 671 number isn't proof that the person is in Guam.
- Don't call back an unfamiliar international number, especially after a single ring. A missed call that tempts you to return it is a known callback trap, and a call to a premium-rate number can cost far more than a normal one.
- Never share verification codes, passwords or card details with someone who contacts you unprompted, whichever country the number appears to be from.
- If calls or messages keep coming, block the number and report it through your mobile carrier.
- Most calls from Guam are ordinary calls from family, friends, colleagues and businesses. If you are expecting one, save the number once the person has confirmed it.
Frequently asked questions
What is the country code for Guam?
The country code for Guam is +1 671. From abroad, dial your exit code (00 from most countries, 011 from the US and Canada), then +1 671 without the plus sign, then the local number. Written locally as (671) 300-1234, an example mobile number in Guam is dialed as +1 671 300 1234 from abroad.
What's the exit code to dial Guam from a mobile?
On a mobile phone you can skip exit codes altogether: type +1 671 and then the local number. From a landline, dial 011 from the US or Canada, 00 from the UK and most of Europe, or your own country's exit code first.
Do I need to drop the leading 0 when dialing Guam?
No. Numbers in Guam have no leading digit to drop: dial +1, then the full local number.
What time is it in Guam, and when is a good time to call?
Guam is on UTC+10. Business hours there (09:00–18:00) are 23:00–08:00 UTC, 18:00–03:00 in New York and 23:00–08:00 in London.
How many digits is a phone number in Guam?
A number in Guam has 10 digits after the country code +1, not counting a leading trunk digit.
How much does it cost to call Guam?
With QuikRing a call to Guam costs $0.07/min to a mobile and $0.07/min to a landline, charged per started minute. You call from your browser, so there is no SIM card, roaming plan or app to set up.
Who is calling me from +1 671?
The code shows which country's numbering plan a number belongs to, not who is calling, and caller IDs can be spoofed. Don't call back an unknown number, block it if it keeps calling, and report it through your mobile carrier.
Which other countries use +1?
+1 is also used by American Samoa, Anguilla, Antigua & Barbuda, Bahamas, Barbados, Bermuda, British Virgin Islands, Canada, Cayman Islands, Dominica, Dominican Republic, Grenada, Jamaica, Montserrat, Northern Mariana Islands, Puerto Rico, Sint Maarten, St. Kitts & Nevis, St. Lucia, St. Vincent & Grenadines, Trinidad & Tobago, Turks & Caicos Islands, U.S. Virgin Islands, and United States. The digits after the code show which one a number belongs to. Numbers in Guam start with +1 671.