How to prevent IPhone from knowing the other numbers send to?

[ferretrex]

I send a text to like 20 people. My friends with IPhone were able to reply a message and everyone in the phone got that message. Is there a way I can send a text using the Message software where none of the IPhone users would be able to reply to all of the people in the text message? I know some people are complaining that they want to stay in the thread. There are sometimes when I want to send a text to people without them replying to all of the members. I would like to set this to BCC so no one will know that I am sending a text message. How can I do this? Please help? I don't want to send 20 text separately at a time. Any suggestions? :-\ :'(