Just fired up the stock messaging app on mine, and it seemed to group just fine. I just type in the first name, select it from the list, type the next, etc. After the second one, a pop up came up to tell me that I was about to enter group messaging. I sent it to my phone, my other, and a few family members. All rec'd as normal. Then, when replying, at the top I can click on the list of people, and it comes up with a list I can edit from there. Or, in the bottom when replying, it shows "Send to all" instead of just Send. Just make sure "Group Conversation" is selected at the top. I'm also on the Verizon version, don't know if that matters with the stock messaging app or not. (I normally use GoSMS btw, but figured I'd test it with stock for this)