If I block someone, will they know it? ..And are their iMessages still retrievable?

I wanna block someone. Both of us have iOS 7, if that matters. Once I block them from my End, will they be notified either immediately or say when they try to send me an iMessage or call? Further, say I unblock them at the end of the week, expecting a flood of messages from her end to come...

Oct 6, 2013 ... End, will they be notified either immediately or say when they try to send me an iMessage or call? Further, say I unblock them at the end of the ...

Lee mas