I recently got a samsung galaxy s4. Its gsm unlocked(from verizon). And recently I've been in group messages and 2 things happen: I will send messages and receive my own message 2 seconds later in the thread. And second, I'll be in the group message and when someone replies, it will come in as an individual text from that person instead of appearing in the group. If anyone could help me, that'd be awesome because the phone itself is cool and I don't want to have to send it back.