MMS messages have error "failed" to send. Some messages actually do go through to the receiver (multiple times) although still says failed on my end. Some messages just don't send. Mobile data is on. Using default Samsung messaging app. Same issue when I switch to Google messaging. It's been over a month and I'm becoming frustrated with this. I have reset network settings, cleared cache, cleared storage, cleared trash, optimized phone, etc. How can this issue be fixed?