I have a couple questions to add to this. I actually have an AT&T S4 but my best friend has a Verizon one and we are having some texting problems. Here's the situation.
I and my two best friends group text ALL the time. We all three previously had iPhones. (myself and another friend on AT&T, the third friend on Verizon). My Verizon friend got an s3, and we were all still able to group text. I got an s4 and can group text with anyone else I want to except my two best friends. If I send a group text to them, my AT&T friend with the iphone's replies come back in the group thread, but my Verizon friend with the s3 comes back individually. However, only individually on my phone. On my iphone friend (ATT), it comes through on the group. And if I reply to my Verizon s3 friend on the individual thread her reply came in on, it starts the individual chatting. In order for my ATT iphone friend to see my reply, I have go to back to the group thread (which makes sense). I have turned off my imessage on ALL my other apple devices. Changed my apple ID password. Gone to apple and unregistered my devices with Apple - ALL of them, then gone back and reregistered the devices I still have. I told my verizon s3 friend to do the same thing but she's not sure how to do it. Could that be the problem?
Also, a potentially unrelated question. When my verizon s3 friend does group texting, she has the tabs at the tbottom where she can switch out between individual and group texting with those specific contacts. She is doing the group option, because my iphone friend is receiving the messages. My actual question is, why don't I have those tabs on my phone? I've searched through setttings and see no way to turn those on automatically, and she said hers came like that by default. Any thoughts on that? Is that just a verizon vs att difference?