How can I tell if someone has blocked my texts?

[TLGuth]

I just sent a message and it said Message Sent.  Doe that mean they got it?

[Snn5 · Accepted solution]

It means it was sent.  Some phones will display Delivered, but you will never know that the text was actually read.  And, you only see "Delivered" when it is a Verizon to Verizon customer text.