Originally Posted by YuropFlyer

That's definitely not true. While it's always a good idea to have everything printed, the Chinese immigration will accept electronic proof as well - it might require a few more calls about your flight / hotel bookings being in order (just as with printed papers) - which means they might disappear with your phone for a while - but having everything electronically won't be a game breaker. No one EVER got denied over having everything just electronically, and not printed out (for solely that reason)

So please stop scaremongering here - the problem NEVER has been with China or Chinese authorities, but (mostly with US- and Japanese) airlines who can't use their tools properly and should be massively fined and penalized by China, or outright banned due to terrible behaviour.

Also, carrying your passport with you in China is a legal requirement. Has nothing to do with "being safe". It's law.