It appears that this number is linked to the GUAM Telephone Authority, which may be using it to verify the status of phone numbers.
Unsolicited call from Guam Telephone Authority – should you worry?
Summary — +16716532300
Expert Opinion
Ever wondered why a mysterious number keeps ringing but never answers? The pattern you’re seeing—busy signals every time you try to call back—often points to an automated verification ping rather than a live person. Government agencies sometimes run these checks to confirm active lines, and the Guam Telephone Authority fits that profile. To protect your privacy, let the call go to voicemail, block the number if it becomes a nuisance, and review your carrier’s opt‑out options for non‑essential outreach. Avoid sharing personal details on callbacks, and consider using a call‑filtering app to flag repeated busy‑signal callers.
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Rate this number — +16716532300
Recent Reports for (671) 653-2300
Similarly, I received a call at 6:36 PM on March 26, 2014, and every attempt to call back has been met with a busy signal.
The experience of receiving a call from this number and getting a busy signal when calling back is a common one.
Multiple attempts to call back have been met with a busy signal, making it difficult to determine the caller's identity.
After missing a call from this number, I've attempted to call back multiple times, only to encounter a busy signal, leaving me wondering who this is and how they obtained my number.
Today, I received a call from this number, which seems to be a familiar experience for many.