The worst thing about SMS authentication in terms of UX is what happens when you're outside your country. I moved countries recently, but I still need to do thi

The worst thing about SMS authentication in terms of UX is what happens when you're outside your country. I moved countries recently, but I still need to do things like retrieve tax statements etc. Some companies only support SMS as a second tier authentication method (some at least allow you to use email as an alternative), some won't allow you to change to a foreign number, some will not be able to send you a text if you're in roaming mode abroad (I keep my old SIM active just for that).