I have a galaxy S8. It is replacing an S8 that I used to have but broke. My current phone is unable to send MMS texts. That includes photos and long messages. I am able to receive but not send. I did not have this problem with my other S8.
I contacted my carrier and they told me that this was a known problem with Samsung galaxy phones and that they could not help me. I think that this is a lot of bull since it worked with my other phone and not this one which is exactly the same model. I read some of the posts here and I tried turning off my Wi-Fi but it still does not work.
This is incredibly frustrating!