E.164 Country Calling Code

Guam +1

Official telecommunications routing registry for Guam. International dialing prefix is +1. Browse all regional numbering plan area codes below.

Current Local Time

02:57:01

UTC • UTC +00:00

Full Dialing Format

+1 (XXX) XXX-XXXX

International Prefix +1

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ISO Jurisdiction GU

MAP

Total Area Codes 2

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Standard ITU-T E.164

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⭐ Major Area Codes in Guam

671 Hagåtña & Territory Area

🗄️ All Numbering Plan Area Codes (NPA)

Select an area code to view local exchange registries, carrier mappings, and geographic zones

2 Area Codes

671 Hagåtña & Territory Area

Guam, a U.S. territory in the western Pacific, uses the North American Numbering Plan (NANP), which means its international dialing code is +1, just like the United States and Canada. This unique integration allows Guam to share the U.S. telecommunications infrastructure, making calls to and from the mainland United States as simple as domestic calls. For international callers, understanding the nuances of dialing +1 for Guam is essential for seamless connectivity. This guide provides comprehensive instructions, area code details, and practical tips for both personal and business communication.

How to Call Guam from Abroad

Dialing a Guamanian number from outside the NANP requires a specific sequence. The process is straightforward but requires the correct exit code for your country, followed by Guam's country code and the local 10-digit number. Here's the step-by-step breakdown:

Step 1: Dial your country's international exit code (e.g., 00 from most European countries, 011 from many Asian nations, or 0011 from Australia).
Step 2: Dial the country code 1.
Step 3: Dial the Guamanian area code 671.
Step 4: Dial the 7-digit local phone number.

For example, if you are calling a local number like 555-1234 from the UK, you would dial: 00-1-671-555-1234. This format applies to both landlines and mobile numbers on the island.

Understanding Guam's Area Code and Numbering

Guam is served by a single area code, 671, which covers the entire island. Because the population is relatively small (about 170,000), there is no need for multiple area codes or overlay codes. All local numbers are 7 digits long, and when dialing locally within Guam, you can simply dial the 7-digit number without the area code. However, when calling from the U.S. mainland or other NANP countries, you must dial 1-671 followed by the 7-digit number. This unified area code simplifies dialing and ensures that all calls to Guam are routed correctly through the NANP.

Special Dialing Rules and Considerations

One of the most important quirks of calling Guam is its status as a U.S. territory. This means that calls from the United States to Guam are considered domestic calls, not international. Therefore, you do not need to dial an international exit code; instead, you simply dial 1-671-xxx-xxxx. This is a significant cost advantage for U.S. callers. However, for callers from other countries, Guam is treated as an international destination, and standard international rates apply. Additionally, Guam does not participate in the U.S. toll-free number system; numbers like 1-800 are not assigned to Guam, and you cannot call a U.S. toll-free number from Guam using a local Guamanian number—you would need to dial the full international sequence.

Emergency and Service Numbers

Like the rest of the United States, Guam uses 911 for emergency services (police, fire, and medical). This number is toll-free and works from any phone on the island. For non-emergency services, local government and business numbers follow the standard 671-xxx-xxxx format. When traveling to Guam, it's also useful to know that the island has robust mobile coverage, with LTE and 5G networks available in most populated areas, but roaming charges may apply if you use a foreign SIM card.

Business and Traveler Tips for Calling Guam

For businesses, Guam's unique position as a U.S. territory in Asia offers a strategic gateway. When establishing communication lines, ensure that your VoIP or PBX system is configured to handle NANP dialing. Many U.S.-based businesses treat Guam as an extension of their domestic network, but be aware of time zone differences (Guam is UTC+10, ahead of U.S. time zones). For travelers, consider purchasing a local prepaid SIM card or using Wi-Fi calling apps to avoid high international roaming fees. When dialing from a hotel phone, check if they require an outside line prefix (often '9') before dialing the international sequence. Also, note that Guam's phone numbers are portable, but the area code 671 is strictly for the island, so you can easily identify a Guamanian number from its prefix.

In summary, dialing Guam is simple once you understand its NANP integration. Whether you're a business looking to connect with partners in the Pacific, or a traveler wanting to stay in touch, the +1 country code and 671 area code are your keys to reliable communication. Save this guide for quick reference, and always confirm your dialing sequence with your service provider to avoid unexpected charges.

❓ Frequently Asked Questions

Is Guam's country code really +1?

Yes, Guam uses the country code +1 because it is a U.S. territory and participates in the North American Numbering Plan (NANP). This means calls from the U.S. mainland to Guam are treated as domestic calls, not international.

How do I call Guam from the United States?

To call Guam from the U.S., simply dial 1 (the country code), then the area code 671, followed by the 7-digit local number. For example: 1-671-555-1234. There is no need to dial an international exit code.

What is Guam's area code?

Guam has a single area code, 671, which covers the entire island. All local numbers are 7 digits long, and the area code is required when calling from outside Guam, even from other NANP countries.

Do I need to dial 011 to call Guam from a country outside the NANP?

No, 011 is the exit code for calls made from the United States. If you are calling from a country outside the NANP, you must use your country's specific international exit code (e.g., 00 from most European countries, 0011 from Australia) followed by 1-671 and the local number.

Are calls to Guam from the U.S. considered international?

No, calls from the U.S. mainland to Guam are considered domestic calls because Guam is a U.S. territory. This means they are typically billed at domestic rates, not international rates, and do not require an exit code.

Is 911 the emergency number in Guam?

Yes, Guam uses 911 for all emergency services, including police, fire, and medical assistance. This is consistent with the rest of the United States.

Can I call a U.S. toll-free number from Guam?

No, U.S. toll-free numbers (e.g., 1-800) are not accessible from Guam using a local number. You would need to dial the full international sequence (your exit code + 1 + the toll-free number), but many toll-free numbers do not accept international calls. It's best to use a local or alternative contact method.