I don't use MMS, but from what I have an understanding of, This might only operate in unique situations. Like when you are are all on iPhones or all are on phones that guidance the RCS messaging technique. Fundamentally when you're not actually using the MMS function. Tello FAQ says https://emilianodztnh.blogoxo.com/38091985/the-smart-trick-of-best-non-voip-phone-number-app-that-nobody-is-discussing