@SamsungQue How do you put your phone in safe mode?
I too am having this issue. I was told by Sprint that MMS messages have never been able to be sent over wifi. If so, then my Note8 does not want to swap between wifi and LTE to send my MMS messages like it has been doing since i got the phone.
Thanks for any insight you might have on this topic.
Same issue here and it appears to be a recent update that's preventing MMS from sending and receiving while on WiFi. This was not an issue before March and it's not my wifi because my wife iphone also on Sprint works fine on WiFi.