What does it mean if a phone rings twice then goes to voicemail?
You got the two ring click or their phone lost signal while you was calling. When you call a cell phone and it's turned off or has no signal or someone is calling at the same time it will go straight to voice mail.
could mean that who ever you're trying to call is out of minutes, or their battery is dead.
Wrong voicemail configuration may be a reason. Or a problem with the sim card. Go to your operator and ask for a duplicate.