voip.ms works for me. There are other sms/mms providers in the field. Email is the only other solution, that I can think of, that avoids all of the "walled gard

voip.ms works for me. There are other sms/mms providers in the field. Email is the only other solution, that I can think of, that avoids all of the "walled gardens". Federated XMPP appeared to have a great start. Matrix is the current best-hope in my eyes though. With companies doing their best to restrict users to their platform, it's going to be difficult to get users onto a system that is as open as email or SMS.