Area Code 671: Hagåtña, GU Reverse Phone Lookup

Area Code 671 — Fast Facts

About Area Code 671

Area code 671 serves All of Guam in Guam. Established in 1997, it covers roughly 0 million people across the Chamorro (ChST) timezone.

If you've received a call from a number starting with 671, you're hearing from someone in or around Hagåtña, GU. This doesn't guarantee the caller is physically located there — phone number spoofing allows any caller to display a local area code. A reverse phone lookup can tell you the actual registered carrier and owner behind the number, regardless of what your caller ID shows.

The 671 area code has been active since 1997 and is managed by NANPA (North American Numbering Plan Administration) under the North American Numbering Plan. Numbers in this area code follow the standard NANP format: (671) XXX-XXXX.

How to Look Up a 671 Phone Number

Looking up a 671 number on RevealNames is straightforward. Enter the full 10-digit number (including the 671 area code) into the search box at the top of this page. Our system cross-references carrier CNAM databases, public records, and spam report databases to return:

• The registered owner's full name — first and last name as registered with the carrier
• City and state location — where the number is registered, which may differ from the caller's physical location
• Carrier name — AT&T, Verizon, T-Mobile, or any of the regional or MVNO carriers serving the Hagåtña area
• Line type — whether the number is a mobile cell phone, landline, VOIP line, or toll-free number
• Spam reports — community-sourced flags if the number has been reported for robocalling, telemarketing, or fraud

Results are returned anonymously — the person you're looking up never finds out you searched their number.

Phone Scams Targeting 671 Numbers

Like every active area code, 671 numbers are regularly spoofed by scam operations. When a call comes from what looks like a local Hagåtña, GU number but turns out to be a robocall or fraud attempt, the scammer is using neighbor spoofing — a technique that replaces the real originating number with a local-looking one to boost answer rates.

Common scams hitting 671 numbers include IRS impersonation calls, fake Social Security Administration notices, auto warranty robocalls, Medicare fraud attempts, and "local business survey" calls that are actually lead harvesting operations. The 671 area code is particularly targeted because of the population density and income demographics of the Hagåtña area.

Before you call back a 671 number you don't recognize, run a free reverse phone lookup above. A genuine call from a business or individual will have a registered name and carrier. A spoofed scam number often shows as unregistered, assigned to a VOIP carrier, or has multiple spam reports attached to it.

If you identify a scam number, report it to the FTC at reportfraud.ftc.gov and the FCC at consumercomplaints.fcc.gov. Your reports help build enforcement cases.

How to Block Calls from 671 Numbers

If you're receiving repeated unwanted calls from 671 area code numbers, here's how to block them by device:

On iPhone

1. Open the Phone app and go to Recents
2. Tap the info button (ⓘ) next to the number you want to block
3. Scroll down and tap Block this Caller
4. Confirm by tapping Block Contact

To block an entire area code on iPhone, enable Silence Unknown Callers under Settings → Phone. This silences all calls from numbers not in your contacts.

On Android

1. Open the Phone app and go to Recents
2. Long-press the number you want to block
3. Tap Block / Report Spam
4. Confirm the block

Google's built-in spam protection (on Pixel and many Android devices) also automatically flags known scam numbers before you pick up.

At the Carrier Level

All major carriers serving Hagåtña offer call-blocking tools: AT&T ActiveArmor, Verizon Call Filter, T-Mobile Scam Shield, and similar services from regional carriers. These apps use network-level blocking to stop confirmed spam calls before they reach your phone.

Area Code 671 FAQ