Guam
Country Code & Virtual Numbers
Guam shares the +1 code with the US mainland, using its own dedicated 671 area code. Capital: Hagåtña · Business hours: 6:00 PM–2:00 AM EST.
What is the +1-671 country code?
Guam's international dialing code is assigned by the ITU (International Telecommunication Union) and used for every call placed from outside the country.
Network & carriers
Guam's telecom market is served by GTA, IT&E, and DOCOMO Pacific as the major carriers.
Numbering format
Guam numbers follow the NANP 10-digit format using the dedicated 671 area code.
Calling culture
Business culture in Guam blends US and Pacific Islander traditions — a warm, relationship-oriented approach is typical.
Guam shares its +1 country code with the US mainland, but its 671 area code is exclusive to the territory.
A quick read on Guam numbers.
Guam numbers follow the same 10-digit NANP format as the US mainland, using the territory's dedicated 671 area code. Rozper stores and dials contacts in full E.164 format automatically, so you never have to think about the formatting.
Want to call Guam from abroad? Dial your local exit code, then 1-671, then the local number.
Best time to call Guam from the US
Guam is on UTC+10 · Business hours = 6:00 PM–2:00 AM EST · Mon–Fri
Why get a Guam virtual number?
A +1-671 virtual number gives your business instant local presence in Guam — without the overhead.
Local caller ID in Guam
When you call from your virtual Guam number, contacts see a local +1-671 number — dramatically improving answer rates.
No office needed
Establish a local presence in Guam without renting space, hiring locally, or installing any hardware.
Instant credibility
A recognizable 671 area code helps build trust with local consumers, distinguishing genuine local presence from generic +1 callers.
Routes to any device
Calls to your Guam number ring your team on mobile, desktop, or desk phone — wherever they work.
Everything to call Guam
The tools to reach Guam contacts reliably and scale your international presence globally.
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CRM auto-logging
All calls to and from your international number auto-logged in Salesforce, HubSpot, or Zoho.
International analytics
Call volume, answer rates, and duration broken down by country, region, and time of day.
Local Caller ID
Show a local country number as your caller ID when dialling internationally. Improves pickup rates significantly.
Instant provisioning
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99.99% uptime SLA
Enterprise-grade reliability for your international calling infrastructure, 24/7.
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Guam questions answered.
Answers about Guam's NANP numbering, business culture, and getting a local virtual number.
Start calling Guam, not tomorrow.
Get a virtual Guam number or make direct international calls to +1-671 — active in under ten minutes.