Deleting blocked numbers on messages list

You're not addressing Apple here. This is a user to user tech support forum, hosted by Apple, and we're just users like you. That said, in my opinion, in addition to the explanations I have already given you, that list must remain available for people who decide to unblock previously blocked numbers, whatever the reason they want to do it.

But if you'd like, you can submit your request/comment/suggestion to Apple directly, using this link:

Apple – Product Feedback - iPhone

Thanks and regards

Giulio

Delete a number? Unsure I can understand your question.

Blocking a number means that that number can't call you (or send you any SMS/iMessage). You can't delete their number since it is not among your contact.

If you meant something different, please better explain your needs.

Giulio

That list (the same that you can see also in Settings>Phone) is checked by your iPhone.

Using that list, it can prevent unwanted phone calls, text messages, or Facetime calls coming from your blocked numbers.

Having no blocked numbers list, how can your iphone check and/or prevent incoming calls?