While using the stock S4 Messaging app, I have noticed that, when you send a text to a group, it sends the text as an MMS not an SMS. This doesn't bother me because the group messaging works well. I have noticed although that it will not send when connected to WiFi. I can send a group message and the little spinning thingy will spin forever while on WiFi, but as soon as I turn WiFi off, it fires the message off right away. Anybody else seen this? If so, is there a solution to this? I particularly like the stock app, so I don't want to change.