I understand the feeling, but SMS really doesn't work. A the end of the day, it is just a hack on top of the telephone network.
There are countries were SMS is actually local to the carrier, and they don't route user messages out of their bounds. In the olden days it was fun asking people where they contract their phone to decide wether to mail them or message them.
Some countries have horrible reliability for SMSes, I think India is a famous one. Trying to do user auth over SMS becomes a nightmare.
Then the issues if you cross borders, where you'll be enjoying both countries SMS idiosyncrasies on top of the round trip costs.
Then carriers won't open SMS to non voice SIMs, even if they get an access to the network. But you'll need to meet specific criteria to get a voice enabled SIM.
All in all, it's a tried and true protocol in limited setups, but not something to hold as a global gold standard (I think there sadly is no global standard to hold on a pedestal...we can hope we make one in the future)
There are countries were SMS is actually local to the carrier, and they don't route user messages out of their bounds. In the olden days it was fun asking people where they contract their phone to decide wether to mail them or message them.
Some countries have horrible reliability for SMSes, I think India is a famous one. Trying to do user auth over SMS becomes a nightmare.
Then the issues if you cross borders, where you'll be enjoying both countries SMS idiosyncrasies on top of the round trip costs.
Then carriers won't open SMS to non voice SIMs, even if they get an access to the network. But you'll need to meet specific criteria to get a voice enabled SIM.
All in all, it's a tried and true protocol in limited setups, but not something to hold as a global gold standard (I think there sadly is no global standard to hold on a pedestal...we can hope we make one in the future)