Group iMessages make it easy to stay in touch with your friends or colleagues, as long as you can keep track of who is in and who is out.
WithiMessages, you choose who gets to be part of the conversation.Here is how you can add and remove people in group iMessages on your iPhone, iPad, or iPod touch.
Add someone to a group text message
Tap the group iMessage that you want to add someone to.
Tap the top of the message thread.
Tap the Info button, then tap Add Contact
.
Type the contact information for the person you want to add, then tap Done.