Blocking on iPhone question

If someone blocks you, there is no sure-shot way to know with absolute certainty that you have been blocked. You can look for possible signs, such as messages not being delivered, calls not going through, or their profile no longer being visible. However, these signs can also occur for other reasons, such as privacy settings, network issues, account deactivation, or changes made by the person.

At best, you can make an educated guess, but a guess is not proof. More often than not, assumptions remain assumptions unless you receive clear confirmation. Instead of overanalysing every sign and drawing conclusions, it is better to acknowledge the uncertainty and move on. After all, not every unanswered message needs an explanation, and not every doubt needs to be resolved.

You are not given any clear indication when you are blocked by another user. The Delivered notification has nothing to do if you are blocked or not. Try calling them, if you receive Voicemail and they don't call you back, then they don't want to communicate with you.