"If you block someone's number, they won't find out right away, if at all. They won't get a notification saying they were blocked and they won’t be able to see the block (plainly) anywhere -- but they can infer and assume they've been blocked."
"Several text message changes can be clues to the other person that they may have blocked: If the text message looks green, it was sent as an SMS instead of an iMessage, 'Not Delivered' in red under the green text bubble, or an iMessage doesn’t show 'Delivered.'"
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