Why can't I send text messages to some people?

[AC Question]

I cannot send text messages to some people.

I can receive text message.
I can send text to some people, but I cannot send text to some people.
I don't know why.

 

[Thomas_George]

Re: I cannot send text messages to some people.

Are you sure that those who could not receive your text had not added your phone number in their Message Blocking List?