That sinking feeling. Your texts are going unanswered, and you're starting to wonder… are you blocked on iMessage? While iMessage doesn't send a definitive 'You've been blocked!' notification (wouldn't *that* be fun?), there are a few clues to look for.
Firstly, check the message bubbles. Are they still blue (iMessage) or have they suddenly turned green (SMS)? A green bubble *could* indicate a block, especially if you previously communicated exclusively via iMessage. However, it could also mean the recipient has no data connection.
Secondly, try calling. If your calls go straight to voicemail without even a single ring, it's another potential sign. This alone isn't conclusive, as the person could have their phone on 'Do Not Disturb' or be busy.
Finally, and this is the most reliable method: ask a mutual friend to contact the person. If they're able to reach them normally, then the likelihood of you being blocked significantly increases. While there's no foolproof method, these clues combined can give you a pretty good idea of whether or not you've been banished from the iMessage kingdom. Good luck (and maybe just move on!).