I don't use MMS, but from what I fully grasp, This might only work in certain instances. Like if you're are all on iPhones or all are on phones that help the RCS messaging technique. Fundamentally when you find yourself not actually utilizing the MMS function. Tello FAQ states MMS https://nonvirtualphonenumberforv03589.worldblogged.com/44095446/5-simple-statements-about-non-voip-number-for-sms-verification-explained