I wrote Practical Help in 3 mins and was nearly late back to work. In our modern times, many people use the mobile phone as an address book, or at least have a phone number stored for everyone they know and many businesses they deal with. I would suggest you really need some sort of paper back up or at least a computer based back up.
I have, but it might be a little behind the mobile phone that just had a new phone number added today.
Lose you mobile phone, and all maybe lost. Drop it down the lav, and all may be lost. Bolt from a fire, you still have your mobile with all the phone numbers, but it is useless once the phone goes flat. For some, it might be now the most precious thing they own.
Many of the surviving victims of fires will have old phones and although I am not a Nokia person, I would reckon Nokias would be in the majority. Did they think to copy all numbers to the SIM card as they fled? Probably not.
Now, all they need is the electric to plug their chargers into. Should I ask Origin/CitiPower/PowerCorp for help? Probably not.