Look at your contacts. In the edit mode, there may be an option (there is on my Droid 2 and my Rezound) to send calls from that caller directly to voicemail. So you create a contact, call it 'Scumbag' or whatever you like, add the numbers that you are trying to block, and select the option to always send Scumbag to voicemail.Is there an app to send certain numbers straight to vmail or block number.
Yep, the two best ones are made by the same company:
Root Call Blocker (for general use):
https://market.android.com/details?id=fahrbot.apps.rootcallblocker.beta
Call Master (for advanced users):
https://market.android.com/details?id=fahrbot.apps.blacklist
These are the only blockers that completely block everything without turning the screen on. Need to be rooted though.