I don't use MMS, but from what I recognize, this would only work in unique circumstances. Like when you're are all on iPhones or all are on phones that help the RCS messaging method. Mainly when you're not essentially utilizing the MMS functionality. Tello FAQ suggests MMS around Wifi is https://cesarpkfxq.canariblogs.com/5-essential-elements-for-non-voip-us-numbers-52622455