What is rings twice and goes to voicemail?

When a call goes straight to voicemail without ringing, it usually means that the receiver of the call has either turned off their phone, has no network coverage, or has their phone in airplane mode.

However, if the phone rings twice before going to voicemail, it typically means the receiver is actively declining the call. This could be intentional if they are busy or unable to talk, or unintentional if they don't see or hear the phone ringing.