Q: Blocking calls on iPhone 5c

I see that by touching the "i" listed after a phone number, I have a choice to "block this caller". Ok I've done this for a few calls (after looking the number up in reverse lookup)   But what if I want to SEE all the numbers I've blocked- how do I do this? I  wouldn't normally need this feature except I ported over my landline number, and you know what that means. But with two elderly mothers, I needed to keep the our phone number they've known for 30 yrs.