I don't use MMS, but from what I fully grasp, this would only perform in certain instances. Like if you're are all on iPhones or all are on phones that support the RCS messaging method. In essence while you are not actually utilizing the MMS function. Tello FAQ suggests MMS https://hectorxyxql.blogprodesign.com/59012395/free-non-voip-number-no-further-a-mystery