Did a quick search and don't think anyone's mentioned this before...
SO!
Came across this nifty little thing, while making great use of work time:
https://www.tesco.com/direct/worlds-smallest-phone-fits-into-your-wallet-li...
It's a credit card sized phone, only about 6mm thick, and no gimmicky rubbish to worry about. When it's turned off, apparently the battery can last up to 6 months. With only a relatively small cost of £35!
First thing I thought of was just turning it off and throwing it in the pack for emergencies?
I know a lot of us have the all singing all dancing smart phones. But let's be honest, the batteries last about 20minutes after a quick scan through the news in the morning, let alone a full weekend out and about. That's not including the inevitable screen smashes and touch screens not working with numb cold fingers.
I know a lot of people will think it's unnessesary, but hey, might come in handy for someone