I never rely on a phone whilst traveling (driving, cycling, hiking). When driving I mostly use built in car GPS or take a secondary dash mount GPS for longer journeys.
When on feet I use one primary eTrex with maps, and always have a cheap secondary hand held GPS without the maps. Plus a paper map. And a set of extra AA batteries.
Google search, maps and other good things you have on a smartphone are nice, but it's way too unreliable to my taste. Battery life is crap, and without a connection the phone is pretty useless, unless you use a mapping app that can download map data. In which case I'd rather use a dedicated mapping device.
EDIT: Obviously all the equipment can't replace common sense. If you see you can't go any further - don't. Even if all your electronic devices tell you otherwise.
I'd never go anywhere risky without a paper map and conventional compass - I actually rarely use a GPS when out on the hill because I want to keep my navigation skills reasonably sharp. I generally only use a GPS device to confirm decisions I've already made in rather "tricky" situations.
When on feet I use one primary eTrex with maps, and always have a cheap secondary hand held GPS without the maps. Plus a paper map. And a set of extra AA batteries.
Google search, maps and other good things you have on a smartphone are nice, but it's way too unreliable to my taste. Battery life is crap, and without a connection the phone is pretty useless, unless you use a mapping app that can download map data. In which case I'd rather use a dedicated mapping device.
EDIT: Obviously all the equipment can't replace common sense. If you see you can't go any further - don't. Even if all your electronic devices tell you otherwise.