What is group messaging in iPhone settings?

What is group messaging in iPhone settings?

Navigate to Settings -> Messages -> Group Messaging -> ON. Group messaging takes advantage of the MMS (multimedia messaging service) features of the iPhone. In order to turn on group messaging MMS Messaging must also be ON. You can always send a text or MMS message to multiple recipients WITHOUT group messaging on.

Why can’t I leave a group chat iPhone?

In the "Details" section, you can quit the thread by choosing "Leave this Conversation" in red. If that option is grayed-out (as seen above), it means someone in the group text does not have iMessage on or is running an older version of iOS. If that's the case, you won't be able to leave the conversation.