Group Messaging = OFF Expectation: Messages NOT sent to the Group
Group Messaging = ON Expectation: Messages sent to the Group
But Apple has it wrong ... reversed ... because message sent with GM OFF are sent to the entire Group, and those sent with GM ON are not.
How can that possibly be intuitive/logical/intentional? It's a bug. Crappy design.
I always thought what you turn on or off is the UI for the grouped message roll up for all subsequent replies. You can't opt out of Group Messages that are MMS because they are Group MMS.
¿Am I misunderstanding?
Edit: 1st link was about a Blackberry w/ Group MMS. Here is one for an Android phone w/ Group MMS: http://www.droidforums.net/forum/htc-rezound/183344-replying...
The Group Messaging setting only affects messages you send out. If a third party wants to (or unwittingly) 'reply all' to an MMS message that included you, your individual Group Messaging setting won't stop that and you will get that message regardless of your setting.
If you don't think it should work this way, then you are asking Apple to not deliver messages that technically are addressed to you.
I do agree that Apple should have done a better job educating users on how it works.