How to know if someone blocked your number? (iPhone)?

I have been try to talk to my aunt for a few weeks, and she has not been answering my text, and when I call her it rings one time then go straight to voicemail. I'm worry she blocked me. I might just be paranoid, because she has no reason to block me as were really close, but she post on facebook and still doesn't text / call me back. How do I know if she blocked me? When I text her would I get a message saying she blocked me? (sorry I don't speak fluently in English and if it is hard to understand)

Buvib

If she's posting to Facebook then she is obviously alive and not in any trouble so if she's not replying to your texts/calls it is likely she blocked you. Or got a new number and didn't give it to you yet. If she didn't block you on Facebook it is likely you're not blocked from her iPhone however there's a possibility she may have not gotten around to blocking you on there yet.

iPhones do not give notification when you've been blocked. It will even say "delivered" but they will not get the message until they unblock you. Phone calls will also ring but the person will not receive them. I'd say message her on Facebook or post to her wall that you've been trying to reach her and asking if everything is okay. If she doesn't respond to any of that or worse, blocks you on Facebook then yes you're blocked unfortunately.