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Guam country code +1 — call Guam & get a number.
A US territory in the western Pacific that dials like home — for Americans, Guam is a 1+671 call with no 011 at all. Here's the full picture: the 671 area code, formats from the mainland, the UK and across the Pacific, today's carriers, live Hagåtña time and weather, and how to put a Guam virtual number to work with MCM.
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Guam at a glance
Los números y datos que necesita antes de marcar.
What is the country code for Guam?
Here's the part that surprises people: Guam doesn't have its own country code. As a US territory inside the North American Numbering Plan, it shares +1 with the mainland and simply uses area code 671. So for anyone calling from the US or Canada it's a plain domestic call — 1 + 671 + the 7-digit number, with no 011. Only callers outside the NANP add an exit code, then 1, then 671.
Code +1 was assigned to Guam by the ITU under the E.164 plan. The “+” means “dial your local international exit code”; on a mobile, press and hold 0 to type it.
Los cuatro significan lo mismo: conectan su llamada a Guam.
How to call Guam from anywhere
The split is clean: inside the NANP, treat Guam like any other US area code — 1 + 671 + number, no 011. Everywhere else, the island becomes an international destination and you prepend your exit code, then 1, then 671.
Ejemplo completo: +1 671 XXXXXXX — elimine el 0 inicial local cuando llame desde el extranjero.
Guam phone number format explained
If you can read a US phone number, you can read a Guam one — they're identical 10-digit NANP numbers: area code 671, a 3-digit central-office code, a 4-digit subscriber number, with an optional 1 for long distance.
Teléfono fijo
671 + 7 digits. Example: +1 671 472 1234. That single 671 code blankets the whole island.
Móvil
also 671 + 7 digits — Guam has no separate mobile area code. Example: +1 671 688 1234. You can't tell landline from mobile by the area code alone.
Guam area codes — major cities
Elimina el 0 inicial local cuando llames desde el extranjero.
| Ciudad | Región | Código de área |
|---|---|---|
| Hagåtña (capital) | West coast | 671 |
| Dededo (largest village) | North | 671 |
| Tamuning / Tumon | Central | 671 |
| Mangilao | Central-east | 671 |
| Yigo | North | 671 |
| Barrigada | Central | 671 |
| Mongmong-Toto-Maite | Central | 671 |
| Santa Rita | South | 671 |
Guam mobile network prefixes
The prefix after +1 tells you which network issued the SIM — though number portability means it no longer guarantees the operator.
Docomo Pacific
GTA TeleGuam
IT&E (PTI Pacifica)
iConnect (ChoicePhone LLC, dba Pulse Mobile)
Guam time zone
Guam keeps Chamorro Standard Time, UTC+10, year-round with no daylight saving — but the eye-opener is the date line. "Where America's day begins" is more than a slogan: noon in Hagåtña is still the previous evening in New York.
Guam mornings sit comfortably alongside Asia-Pacific business hours. For the US mainland, your evening is Guam's next-day midday — so a US-evening call reaches a fresh Guam workday. Local hours run 08:00–17:00 ChST.
Open the interactive best-time-to-call plannerCommon mistakes when calling Guam
Casi todas las llamadas internacionales fallidas se deben a un problema de formato, no a un problema de red.
Americans should not dial 011 to reach Guam. This is the single most common error: Guam is inside the NANP, so from the US or Canada it's a domestic 1-671 call
adding 011 treats it as international and the call won't connect as you expect.
Assuming Guam needs its own country code: it doesn't
it rides on +1 with the rest of the US.
Picturing 671 as a mainland area code: it's a Pacific island on UTC+10, not a stateside number despite the familiar format
Picturing 671 as a mainland area code: it's a Pacific island on UTC+10, not a stateside number despite the familiar format.
Underestimating the date line: Guam can be a full calendar day ahead of the mainland, so "today" there may be "tomorrow" for you
Underestimating the date line: Guam can be a full calendar day ahead of the mainland, so "today" there may be "tomorrow" for you.
Expecting mobile and landline to differ by code: both share 671
Expecting mobile and landline to differ by code: both share 671.
Tips to reduce the cost of calling Guam
From the US or Canada, 671 is domestic NANP
but confirm your plan actually treats it that way, since some carriers bill territories oddly.
Give contacts a Guam 671 virtual/DID for local-rate inbound.
Calling from outside the NANP? Route over VoIP/SIP to dodge premium international tariffs.
Respect the date line
schedule inside ChST business hours so you're not trading missed calls across a day's gap.
Why businesses get a Guam virtual number
As a US territory and a regional hub for the Marianas, Guam is a foothold into the western Pacific — and a 671 line makes you reachable on both sides of the date line. 6 cards:
Tasas de respuesta más altas
Higher answer rates — a local 671 caller ID gets picked up where an unknown number stalls.
Menor fricción de confianza
Lower trust friction — islanders see a number that belongs to Guam.
Entrada más barata
Cheaper inbound — pull Guam traffic onto VoIP instead of toll routes.
Enrutamiento centralizado
Centralized routing — forward 671 calls to teams anywhere, in any time zone.
Expansión más rápida
Faster expansion — serve Guam and the Marianas without an office on-island.
Presencia real de PSTN
Real PSTN presence — a genuine, dialable 671 footprint.
Guam números virtuales con Mi País Móvil
Anchor a 671 presence in the Pacific and route it anywhere, with enterprise voice underneath. 9 feature bullets:
DID locales en los principales códigos de área: aprovisionados en minutos
Desvío de llamadas a cualquier teléfono móvil, fijo, terminal SIP o softphone en todo el mundo
Voz HD con G.711, G.729, Opus y AMR-WB: negociación automática por llamada
Latencia inferior a 150 ms en los principales corredores de voz a través de PoP distribuidos
SLA de tiempo de actividad del 99,99 % respaldado por infraestructura con redundancia geográfica y conmutación por error sub-2
Compatibilidad con WebRTC para llamadas basadas en navegador sin instalaciones de softphone
API REST para aprovisionamiento, enrutamiento y registros de detalles de llamadas (CDR)
Protección contra fraude incorporada con detección de anomalías por IA y AGITACIÓN/AGITACIÓN
Monitoreo de red 24 horas al día, 7 días a la semana y soporte dedicado
How to get your Guam virtual number
Most businesses are live within hours, not days.
Grab a 671 number for the island.
Clear a quick account and documentation check.
Set your route — SIP, app, or PSTN forwarding.
Go live and start taking 671 calls.
Other country dialing guides
More country codes worth bookmarking.
Get a Guam virtual number with MCM
Set up a 671 line and reach Guam as easily as the mainland reaches it.
Guam +1 — FAQ
If I'm in the US, do I dial 011 to call Guam?expand_more
No — that's the classic mistake. Guam is in the NANP, so it's a domestic 1 + 671 call with no 011.
Does Guam have its own country code?expand_more
Not separately — it shares +1 with the United States and is identified by area code 671.
From outside the NANP, how do I reach Guam?expand_more
Use your exit code, then 1, then 671 and the 7-digit number.
Why does noon in Guam read as last night in New York?expand_more
Guam sits at UTC+10 on the far side of the date line — it's often a full calendar day ahead of the mainland.
Can I tell a Guam mobile from a landline?expand_more
Not by the number — both use 671, with no separate mobile code.
What currency and emergency number does Guam use?expand_more
The US dollar and 911, exactly as on the mainland.
Does Guam observe daylight saving?expand_more
No — Chamorro Standard Time (UTC+10) holds all year.
Can a business get a Guam virtual number?expand_more
Yes — MCM provisions local 671 DIDs with HD voice, routing and APIs.