Calling Guam from Japan: 010 1-671 [local number].
Quick answer
To call Guam from Japan, dial 010, then 1-671, then the local number without leading zeros. Example: 010 1-671 +1 671 300 1234.
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Dialing format
010 1-671 +1 671 300 1234
Exit code • Country code • Local number
Whether you’re calling family, friends, or business contacts, knowing how to call Guam correctly helps your conversation start smoothly. This guide covers the essential dialing steps, including country and area codes that are easy to miss. By the end, you’ll be ready to connect confidently with anyone in Guam - whether you’re calling Hagåtña or anywhere else.
Follow these simple steps to make a call to Guam from Japan
Start by dialing 010 (or use + on mobile). This is the international dialing prefix for Japan.
Dial the country code +1-671 for Guam.
Dial the local phone number in Guam (typically 8-10 digits, without any leading zeros).
Full format: 010 1-671 [local number] - For example: 010 1-671 612 345 678
International Dialing Format
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Calling Code
+1-671
Capital of Guam
Hagåtña
Region
Oceania (Micronesia)
Currency of Guam
United States dollar ($)
Guam Time Zones
UTC+10:00
Current time
Your time
--:--
Guam
--:--
Guam is --
Guam, located in Micronesia, is a nation with a rich identity. Its capital city, Hagåtña, serves as the administrative center for a population of approximately 154K.
The official currency is the United States dollar ($). When calling Guam, the country code is +1-671. The country observes the UTC+10:00 time zone(s), and the primary language(s) spoken include Chamorro, English, Spanish.
Population
154K
Population Rank
#185 of 230
Language Footprint
Chamorro, English, Spanish
Time Zone Footprint
UTC+10:00
City/Area Code Coverage
No city-level entries yet
Dial Code Status
Exclusive code in dataset
Guam currently has a 10-digit local number pattern in this guide, with country code +1-671.
Exit Code in Japan
010 (dial 010 (or + from mobile))
Japan Country Code
+81
Route Dialing Pattern
010 1-671 +1 671 300 1234
Capital Time Difference
1h destination ahead
Best Calling Window (Origin Time)
08:00-17:00
Currency Pair
Japanese yen (¥) -> United States dollar ($)
Primary languages: Japan (Japanese) and Guam (Chamorro, English, Spanish).
Shared language overlap: No direct overlap in primary language list. Primary timezones: Japan (UTC+09:00) and Guam (UTC+10:00).
Use this route profile to plan a real call from Japan to Guam, including the exit code, destination country code, time difference, and local context.
From
Japan
To
Guam
For dialing this route, callers in Japan usually start with 010 or the plus sign, then dial +1-671 before the local Guam number.
Japan's primary timezone in this dataset is UTC+09:00, while Guam's is UTC+10:00. A practical origin-time calling window is 08:00-17:00.
Japan callers are represented by JP/JPN, with Tokyo as a capital reference point, Eastern Asia, 123M people, Japanese yen (¥), and primary language context of Japanese.
Origin exit prefix: 010 or + from mobile. Origin country code: +81. Origin time zones: UTC+09:00.
Guam is represented here by GU/GUM, Hagåtña, Micronesia, about 154K people, United States dollar ($), and primary language context of Chamorro, English, Spanish.
Destination calling code: +1-671. Destination time zones: UTC+10:00. Rate check: check live price before dialing.
This route combines Japan's outbound dialing rules with Guam's destination numbering and local schedule. The primary timezone relationship is 1h destination ahead, and the recommended origin-time window is 08:00-17:00.
Dialing sequence: 010 1-671 local number. Business-hour window: 08:00-17:00. Time relationship: 1h destination ahead.
Destination market: Guam is in Micronesia, with Hagåtña as a main administrative center. Calls from Japan may reach family, companies, banks, hotels, clinics, or public offices across a market of about 154K. Primary language context: Chamorro, English, Spanish. Local billing and everyday prices use United States dollar ($).
Route context: Japan is listed in Eastern Asia with a population of about 123M; Guam is listed in Micronesia with about 154K. The main listed languages differ: Japan (Japanese) and Guam (Chamorro, English, Spanish). Currency context also changes across the route: Japanese yen (¥) in Japan and United States dollar ($) in Guam.
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