Lets be clear Mr Hancock's record on Apps is now a busted flush, what with his own App hacked in minutes and the failure of the Covid-19 app strategy.
Hospitals should choose what is right for them. Pages are brilliant for local comms in buildings often with lots of steel and concrete. In addition faxes are brilliant for transmitting quick drawings of schematics if you do not have the document to hand. Its also handy to have a backup when the internet is down. This is a bad case of the Emperors new clothes with any new solution costing 3 times as much and not actually working for the crash team, which means it may not work for you when you are in need.