I don't use MMS, but from what I realize, This may only work in certain conditions. Like when you are are all on iPhones or all are on phones that support the RCS messaging program. Basically when you're not basically using the MMS purpose. Tello FAQ says MMS about Wifi https://troyxtnfw.blogadvize.com/45933779/top-latest-five-non-voip-sms-verification-urban-news