I recently got a new Samsung Galaxy S20 Plus, switching from a different kind of Android phone.
One thing that I've been struggling with lately is MMS. I can send and get texts just fine. I can even send pictures and the other person gets it. However, when others send me MMS, I can't get it. What was really strange is that, the other day, in the same conversation, someone sent me an image and I got it, but, a couple messages later, they tried sending me a couple more images but instead of seeing the image, it said No subject. Message size: (the size) and an expiration date/time. It looked like I needed to download the message but it never loaded/wouldn't let me download it. It's really weird that also it supposedly expires? This has happened a few times now and it's like I can't get pictures/MMS at all. What's up with that? What can I do to fix it?
try download samsung members app and submit a ticket.
once you open, click +, then click error report
samsung can tell if its network(carrier) issue or device issue