Guam Calling Code: +1
Complete guide to calling Guam — international dialing code, step-by-step instructions, and FAQ.
How to Call Guam from Abroad
đź“ž Step-by-Step Dialing Guide
- Dial your country's exit code (e.g. 011 from US, 00 from most countries, + from mobile)
- Dial +1 — the country calling code for Guam
- Dial the local phone number (area code + subscriber number)
About Guam Calling Code
To reach Guam from another country, first dial the international calling code +1 — assigned by the ITU — followed by the local number. Guam is located in Oceania, in Micronesia.
Guam is known locally as Guåhan — Hagåtña is the capital. When saving an international contact, write the number in full international format with +1 so it works from any country.
International calling codes follow the ITU-T standards E.123 and E.164, which define how phone numbers are written and dialed across borders. The prefix you dial after the exit code tells the global telephone network which national network to route the call to.
Where the +1 Calling Code Is Used
The country code +1 is assigned to Guam, located in Micronesia, with the capital Hagåtña. This code is part of the international telephony numbering plan and is used for all calls made to Guam from outside the country.
When a number is written as +1 …, the +1 prefix directs your call to the Guam national network. After the prefix, dial the area code without its leading zero, then the subscriber number — the same pattern for landlines and mobiles.
ITU-T E.164 groups calling codes by world region; codes beginning with 1 cover the part of the world that includes Guam, in Micronesia. Storing numbers with +1 and omitting the domestic leading zero keeps contacts dialable from anywhere.
The country code +1 is shared with United States, Canada, American Samoa, Anguilla, Antigua and Barbuda, Bahamas, Barbados, Bermuda, Cayman Islands, Dominica, Dominican Republic, Grenada, Jamaica, Montserrat, Northern Mariana Islands, Puerto Rico, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Sint Maarten, Trinidad and Tobago, Turks and Caicos Islands, US Virgin Islands, British Virgin Islands. After dialing +1, the following digits (area code + subscriber number) route the call to the correct country, so you must always include the full national number.
Guam Phone Number Formats
The ITU E.164 format for Guam numbers is +1 + area code + subscriber number, used for landlines and mobiles alike. Here is the general structure:
📱 Number Structure
- International format: +1 [area code] [subscriber number]
- From abroad: exit code + +1 + local number (drop the trunk prefix 0)
- Within Guam: dial the local number directly
Numbering plans vary: closed plans use fixed-length national numbers, while open plans allow variable lengths with a trunk prefix (usually 0) that is dropped for international calls. For calls to Guam, replace the trunk zero with +1.
Time Zone in Guam
The local time in Guam follows the Pacific/Guam time zone (UTC+10:00 UTC). Check the time difference before you dial so your call arrives during waking hours.
Time differences matter when calling Guam: if it is UTC+10:00 there, a morning call from Europe may reach Hagåtña in the afternoon, while callers in the Americas should check the offset to avoid late-night calls.
If Guam observes daylight saving time, its UTC offset shifts by an hour twice a year. Double-check the current offset before time-sensitive calls, especially in spring and autumn.
Emergency Numbers in Guam
If you need urgent help while in Guam, dial the local emergency numbers below. Note that these numbers are only for use inside Guam.
| Service | Number |
|---|---|
| Police | 911 |
| Fire | 911 |
| Ambulance | 911 |
Example: Calling Guam Numbers in Practice
Here is how a typical call to Guam works, depending on where you are calling from:
🌍 From the United States or Canada
- Dial the US/Canada exit code 011
- Dial the Guam country code +1
- Dial the local number (area code + subscriber number, without the trunk prefix 0)
Example: 011 +1 [area code] [number]
🌍 From the United Kingdom or Europe
- Dial the international access code 00 (or use the + symbol on mobile)
- Dial the Guam country code +1
- Dial the local number
Example: 00 +1 [area code] [number], or +1 [area code] [number] from any mobile phone
If the local number begins with a trunk prefix (commonly 0), remove it when dialing internationally — +1 takes its place. The remaining digits are dialed exactly as written.
Calling Guam from Major Countries
International exit codes differ by country. Use this reference when dialing Guam (+1) from abroad:
| Calling From | Exit Code | Full International Dialing |
|---|---|---|
| United States | 011 | 011 1 [local number] |
| United Kingdom | 00 | 00 1 [local number] |
| Australia | 0011 | 0011 1 [local number] |
| China | 00 | 00 1 [local number] |
| Japan | 010 | 010 1 [local number] |
| India | 00 | 00 1 [local number] |
| Germany | 00 | 00 1 [local number] |
| France | 00 | 00 1 [local number] |
On mobile phones, the + symbol replaces the exit code entirely — just dial +1 followed by the local number.
Frequently Asked Questions
What is the calling code for Guam?
The international calling code for Guam is +1.
How do I call Guam from the United States?
Dial 011 (US exit code), then +1, then the local phone number.
How do I call Guam from the United Kingdom?
Dial 00 (UK exit code), then +1, then the local phone number.
Can I use the + symbol instead of the exit code?
Yes! On mobile phones you can dial +1 directly followed by the local number. The + symbol automatically replaces your country's exit code.
How do I call within Guam?
If you're already in Guam, simply dial the local number directly. You do not need to use the country code +1 for domestic calls.
What is the capital of Guam?
The capital of Guam is Hagåtña. When calling the capital from abroad, dial +1 followed by the local area code (without the leading 0) and the number.
What are the emergency numbers in Guam?
Police: 911, Fire: 911, Ambulance: 911. These numbers are only valid inside Guam.
Other Countries in Oceania
Nearby countries and their calling codes:
Calling Guam from American Samoa or Northern Mariana Islands works the same way: dial your local exit code first, then +1, then the local number. Within Oceania, many callers simply use the + symbol on mobile to avoid exit-code differences.