Verify Guam Phone Numbers - Country Code +1-671
Our phone number lookup tool above instantly verifies whether a phone number belongs to Guam by analyzing its country code and number format. Guam phone numbers use the country code +1-671 and follow an (671)+7 digits national format.
| Country: |  Guam (GU, GUM) |
|---|---|
| Country Calling Code: | +1-671 |
| National Number Format: | (671)+7 digits |
| Example Number: | +1 671 688 1234 |
| International Dialing Prefix: | 011 |
| National Trunk Prefix: | 1 |
| Time Zone (UTC/DST): | +10 |
| Regulator: | - |
Reverse Phone Lookup
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Calling from Guam to the United States
To call United States from Guam, follow this exact dialing sequence:
- 011 - Guam's international access code
- 1 - United States country code
- Area Code - Specific U.S. area code
- 7-digit number - The local phone number
Example: To call (312) 555-0123 from Guam, dial: 011 1 312 555 0123
Useful tip: Verify phone number ownership before dialing to avoid charges using a United States caller identification service. If you know you should be calling to a specific U.S. city, let's say Jacksonville, then you should use phone number lookup tool for Jacksonville, Florida, or its area code (904).