I too am having this issue. Mine is a Samsung Galaxy Note 4. The first duplicate text was at 9:12pm on Monday, April 4. Every text I receive from a single individual comes as duplicate. My group texts that come in are fine and only deliver once. I have read several other people's answers and tried each one and it is still happening. I have no other messaging apps on my phone except the Verizon messaging app, I have cleared the cache for that. I have uninstalled it and restarted. Still happening. What can i do try now?