Calls from Blocked Numbers

[Stefanie917]

I've recently been receiving calls from a 'blocked number'.  When answered, there is no one that responds.  Is there a way to block them and send straight to voicemail? I use a 4S device.

[tikibar1]

There are apps in Google Play that do this, wonder if there are any in iTunes?  You also could use Verizon's Usage Controls, but it costs $4.99 per month.