How to know if someone blocked you on iPhone?

My imessage works for every one of my contacts except one person. It doesn't say error or anything it just doesn't say delivered. However when i send it as a text message it says 'sent'. So is that a sign that the person blocked me?

Is it possible that they have turned their imessage off for whatever reason (sometimes my phone does this when I change my time and date), thus not allowing it to work, and you won't be able to send them an imessage it will just say normal message… Hope that helps

You won't know if you are blocked or not.

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