Bletchleyite
Veteran Member
UNBREAKcable screen protectors - the phone owners' defence against gravity - tested to destruction by Mrs talldave!
Screen protectors and bump cases do generally work, even cheap ones. Even phone manufacturers agree - some phones are actually supplied with them already installed. When I had a Oneplus phone years ago that did, for instance. It is odd that the industry sells devices to which almost everyone will add protection rather than selling them pre-protected, but that's where we are I guess.
== Doublepost prevention - post automatically merged: ==
I'd warn that the lack of this is an explicit design choice to prevent any single point of failure.
Tickets are encrypted so that their content can be trusted without the need for any centralised system.
That has upsides and downsides. Resilience of the system is an upside (though it is possible to have replication between systems) but resilience from a passenger perspective (e.g. broken phone, lost printout, been mugged) is a definite downside.