When it says "your call has been forwarded to voicemail," it means the person being called is currently unavailable to answer the phone. This can happen for several reasons such as the phone being off, the person being busy or on another call, having Do Not Disturb mode enabled, poor network coverage, or the call being manually declined. Essentially, the call is redirected automatically to the recipient's voicemail system so the caller can leave a message.

This message does not necessarily mean being ignored or blocked, although if calls go straight to voicemail repeatedly without ringing, blocking could be a possibility. Usually, the call ringing a few times before forwarding shows the recipient is temporarily unable to pick up or busy.

The forwarding to voicemail is a way to ensure missed calls can still be answered later through voice messages.