Yak!
Simply the best App for free iPhone to iPhone SMS style texting, including group chats, PHOTO messaging and read receipts.!
Fed up with paying to SMS your friends? You have iPhones? Great! Then Yak is for you.
Exactly like SMS or the Blackberry Messenger you can instantly message one or more of your friends at once.
Get instant notifications of incoming messages even when the App is not running, and don't worry about missing messages as they are stored offline until you can retrieve them.
Seriously, why waste money on SMS and why waste time talking to people one on one when talk to them all at once with Yak!?