I don't know how true is this, because as far as I know all transactions that made by cryptocurrency business are done by using internet connections, and without internet connection, we cannot access bitcoin at all.
I believe this to be legit. However I can't try it for now since the areas where this service is available is only at select few US Canadan and others.
SMS and internet protocol are two different things but are analogous. They function similarly and provides services.
This innovation is quite genius as this answers a few drawback with only using internet.
Hope other cryptos will find a way and develop more using this technology.
I would like this to be available in our country