Thanks for your inquiry. If you getting a received notification that your message went through, it would stand to reason your number was not blocked. If your message was blocked, you would have received a message back to you advising you the message was not able to be delivered. If you did not receive a reply from the person who you sent a message to, inquire if they sent a reply. Also, ask if they can send you a message to see if you receive it or not. If the message did not go through, ask what error message was received why the reply message was not able to be sent to you.