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A phone can be a versatile tool when you install and use the right apps.
Have a solution that can work offline like osmand. Download the data for your area and other areas that might be needed. Also try it out offline - e.g. in flight mode.
Google-Play might not work - in fdroid you can point to alternative repositories. When using the default repository you can also be pretty sure the app is libre/FOSS - as are all apps mentioned here. Also learn how to install apps without an appstore.
So the phone can replace a torch but IMHO you should still have a real emergency LED-torch
Direction can be useful - also learn how to read it.
Have a game app to fight boredom and keep the mind stimulated - I recommend gobandroid to play the ancient game of go which has simple rules but is still immensely deep.
I recommend PassAndroid - just imagine how sad it would be if you get the ticket to the rescue ship in esPass format and have no way to display ..-)
I recommend the Material Tea timer. Tea or infusions in general will be a thing in these situations.
Have a Music app that is not a streaming solution and some uplifting music ( I suggest DUB or reggae - but download whatever works best for you )
A cryptocurrency wallet - fiat money/banks might not work anymore - have a crypto wallet like the Bitcoin-Wallet. Also transfer a little bit of value on it and learn how to use it.
Install some PDF reader - and perhaps download some books or manuals.
Install a offline working dictionary and install the languages that you are most likely to face.