Network & carriers
Guam's telecom market is served by GTA, IT&E, and DOCOMO Pacific as the major carriers.
+1-671 · GU · UTC+10
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.
// The Basics
What is the +1-671 country code?
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.
Did you know
Guam shares its +1 country code with the US mainland, but its 671 area code is exclusive to the territory.
// Quick Facts
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.
Best time to call Guam from the US
Guam is on UTC+10 · Business hours = – EST · Mon–Fri
// Why a Virtual Number
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.
Free tools
Look up a number from Guam
Phone number checkerCheck the country and format of a number from Guam instantly.Phone number validatorValidate a number against its country's formatting rules (E.164).Carrier lookupCheck a number's country and format for free; live carrier data comes with the Lookup API.All country codesDialing codes, time zones and calling guides for every country.
Frequently Asked
Guam questions answered.
Answers about Guam's NANP numbering, business culture, and getting a local virtual number.
Dial 011 (the US exit code), then 1-671, then the national number, leaving out any domestic trunk prefix (such as a leading 0).
Start calling Guam, not tomorrow.
Get a virtual Guam number or make direct international calls to +1-671 — active in under ten minutes.