If the call goes right to voicemail ... issue with the receiver's phone. If by any luck they haven't blocked you there as well, they will see your message when they're back online, but they ...

Numbers can be easily blocked on Android: it only requires a user to tap the Phone app, tap the More menu (the three-dot icon ...

However, if the phone rings when you call, you get automated ... Try calling. If it goes to voicemail after barely one ring, you may have been blocked. The message status method won't work ...