It’s odd that the line rang without a voicemail, then vanished when you tried to call back. Numbers with the +64 987 prefix belong to New Zealand, but many scammers spoof regional codes to appear local. Without a registered owner, the call could be a spoofed outbound test, a robocall, or a misdial. To stay safe, avoid returning calls to unknown IDs, let the call go to voicemail, and consider using a call‑blocking app that flags unlisted or suspicious numbers. If the call persists, report it to your carrier and log the timestamp for any future investigation.
Received a call that left no voicemail. When I called back, the number wasn't in my contacts, so I have no idea who it was.