Well, for "my emergency use" I put a contact name that's basically something like "0_If Found Call". I'm hoping if a nice person found my phone, they might look at the contacts. You could always call one like Home or mom or something. I just made it easier.

I have an app, that if I TXT a message with a certain subject to my phone, the ring volume raises to max. This is so i can do the locate thing by calling it.
My phone has a few hiding places it likes. Side of the car seat, bed, side of a chair. I try to only put the phone in specific spaces like sid eof the bed (charging), Living room couch (charging), and on top of a TV.

So, the most important thing is for me to be able to find my phone.

I do need to add the police non-emergency number like a tree down in a road in my contacts list and I do need to back-up my SIM card. I have a specific device that can do that.

I have a very early Android device that's practically useless.