If we're sure and agree that "v1" is not going to support SMS MT+MO, we can continue to work on this change in a branch, on the client and server sides to continue the prototyping - and leave master with a single auth method.

But if we're talking about a v1 of this app for MVP, we kinda need to urgently make sure that we're have it working with the selected SMS backend. (or if several, define how the selection works)