Giro used to do a sticker to fill out your emergency contact details on and clag inside your helmet, not a bad idea.
As my phone is just a phone, not a key to unimaginable riches, and portals unknown, I’m quite happy not to lock it (maybe a cheap nasty emergency phone is better to carry while riding anyway, you know in case you might damage it).
I don’t have an ICE contact though I guessed they’d look for Home, Dad, Mum etc. and maybe the most recent/popular texts/calls.
Edit: Oh and I’m thinking of getting a Tattoo in arabic that says “please look after this bear”