If you keep getting silent calls that never leave a voicemail, it’s probably a robocall or a missed‑call scam trying to get you to call back. Hang up and don’t ring them back—those numbers often charge premium‑rate fees or try to trick you into giving personal info. Block the number in your phone settings and consider reporting it to your carrier’s spam‑filter service. If you’re curious, you can look up the prefix (+64 is New Zealand) but treat any follow‑up call with caution.
The caller never leaves a voicemail; they call back shortly after, still without leaving a message.