Lots of us probably come to rely too much on our smartphones. I still carry a little cash (and a few other things in a small wallet) and usually do things like print out trip itineraries but, even so, But, even so, I know if I lost/had stolen my smartphone on a trip there's still a lot more information I probably would wish I had with me.
I was robbed once in Spain, lost my laptop, tablet and passport. Thankfully, I retained my smartphone which made everything a lot easier to deal with. For instance, the local consulate was super helpful in getting me issued a temporary passport but I would have had a hell of a time even finding her without my phone.
