best straight to voicemail app?

[amcwilton]

I just tried using slydial on my htc thunderbolt, it sounded like it was dialing then a voice came on and it said it was taking me to the persons voicemail, but then it started dialing again and the person who I tried it on picked up. Is there another app out there that can take me straight to a person's voicemail without their phone ringing?