Guam Phone Number Format
Country code +1 · ISO GU
How to format, dial, and validate Guam phone numbers, with live examples.
Country Code
+1
National Prefix
1
International Prefix
011
Mobile Portability
No
Try it now
Pre-filled with a valid fixed line number for Guam. Edit it and click "Try It" to see the parsed result.
Number Types & Example Formats
Each Guam phone-number type supported by libphonenumber, with a real example formatted three ways.
| Type | Length | National | International | E.164 |
|---|---|---|---|---|
| Fixed Line | 10 digits | (671) 300-1234 | +1 671-300-1234 | +16713001234 |
| Mobile | 10 digits | (671) 300-1234 | +1 671-300-1234 | +16713001234 |
| Personal Number | 10 digits | (500) 234-5678 | +1 500-234-5678 | +15002345678 |
| Premium Rate | 10 digits | (900) 212-3456 | +1 900-212-3456 | +19002123456 |
| Toll Free | 10 digits | (800) 212-3456 | +1 800-212-3456 | +18002123456 |
How to Dial Guam Numbers
From abroad
Dial +1 followed by the national number, dropping any leading 1.
Within Guam
Dial 1 before the local number to make a domestic call.
Dialing out of Guam
Dial 011 followed by the destination country code and number.
Area Codes
Browse Guam area codes with cities, timezones, and example numbers for each.
Validate a Guam Number with the API
Send the number to the free libphonenumber API to get the parsed country, type, formatting, and validity.
curl https://libphonenumberapi.com/api/phone-numbers/+16713001234Frequently Asked Questions
What is the country code for Guam?
└ The international country code for Guam is +1. Use this prefix when dialing Guam numbers from another country.
How long is a Guam phone number?
└ Guam phone numbers are typically 10 digits, not including the +1 country code.
How do I dial a Guam phone number from abroad?
└ From abroad, dial +1 followed by the national number, dropping any leading 1. Within Guam, dial 1 before the local number.
How do I validate a Guam phone number programmatically?
└ Send a GET request to https://libphonenumberapi.com/api/phone-numbers/<number>. The free libphonenumber API returns the parsed country, format, type, and validity for any number — no API key required.
Other Countries with Dialing Code +1
These countries share the same international dialing prefix as Guam.
- American Samoa +1
- Anguilla +1
- Antigua and Barbuda +1
- Bahamas +1
- Barbados +1
- Bermuda +1
- British Virgin Islands +1
- Canada +1
- Cayman Islands +1
- Dominica +1
- Dominican Republic +1
- Grenada +1
- Jamaica +1
- Montserrat +1
- Northern Mariana Islands +1
- Puerto Rico +1
- Saint Kitts and Nevis +1
- Saint Lucia +1
- Saint Vincent and the Grenadines +1
- Sint Maarten +1
- Trinidad and Tobago +1
- Turks and Caicos Islands +1
- U.S. Virgin Islands +1
- United States +1