How can I tell if my number is blocked when I try to text someone?

When I text John Doe I never get a response. How can I tell if my number is blocked by John or is he seeing the text and ignoring it? I'm using a iPhone. Can I prevent John from blocking it? How can I hide my number or spoof a different number from the one he blocks?
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JohnBusiness Consultant (Owner)Commented:
When you text you should see an overt confirmation that the text is being sent. If you see this, it was sent and your system is OK.  

Given this, if people you know do not answer, ask them why to get to the bottom of it.

If my texts do not land, I can tell because they do not confirm sending.
Scott CSenior EngineerCommented:
You can't.  

If your number has been blocked by someone else, then you will be able to send SMS / iMessage but it will never be visible for the user as iOS will not make it visible to them as they have blocked it, it is similar when you call that number the call get disconnected after a ring but will not show up as a missed call on their phone.

Try this article to gather some clues, but in the end, you can't know for sure.

That's why a number is blocked...for privacy and to have no contact whatsoever with that person.

You can't stop someone from blocking you....that's why it's called blocking.

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Scott CSenior EngineerCommented:
John, no worries.  I figured one of the questions would get deleted, so I was covering my bases with my answer.
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