When you Block Caller on iPhone, does it completely block them or do they show up as Unknown?

I routinely "Block Caller" telemarketers, so does using the iPhone "Block Caller" option block all calls, or will the calls still come through and just show up as "Unknown"?

I've received a lot of "Unknown" phone calls lately, so that's what I was attributing it to.

What is happening is that the telemarketers are calling you back from a different line than the one you blocked. When you block a number, only that exact ten digit (in US) # is blocked. It is an easy matter for the telemarketer to simply call you again, but using a different #. The next step I would take if I were you is to investigate anonymous call rejection.

http://www.wikihow.com/Block-Unknown-Callers

I got so tired of the calls. I have a app that works to reveal the numbers and I block and report them,. I even called THEM! Got it through http://www.seeblockednumber.com

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