what message are they(blocked numbers) gonna get if they try to call me?
I blocked someone on my phone, if she tries to call me, is there an error message that she will get?
iPhone 4S, iOS 7.0.3
Nope. The call/message simply won't go through. If iMessage, it will show as delivered, but it actually won't be delivered.
Here's what it sounds like on their end:
http://www.wired.com/images_blogs/gadgetlab/2013/09/blocked_ios7.mp3