Group messaging using an iPhone Is there a way to send group messages on the iPhone without an app? And without individually choosing the contact in the group?
The iPhone's built-in Messages app can send group messages: open the app, go to the messages list, hit the Compose Message button in the upper-right corner, and use the Add (+) icon in the To: field to add multiple recipients.

You cannot, however, add an entire group as a message recipient; multiple recipients must be added one at a time.