I have an LG Stylo 2 and I use Textra as my messaging app. A couple of days ago my phone ran some updates, Textra included, and now I cannot get or send mms messages.
I have tried everything I could think of or find on Google and nothing has worked. I do not have Mobile Data. I only use wifi and it has never been a problem (I don't know why every solution I have found says you have to have mobile data.)