I just received a text message on my iPhone. I have not yet opened the message, but I can see the first line. It is from a relative of mine. Is there any way for me to tell if this text message was sent from an iPhone? I just don't want this person to know if I've read the message. If she has an iPhone, then it will tell her that I've read the message. But if she has some other phone, then she won't know if I read the message.