Re: Please Note
I use OsmAnd+ with offline maps on a waterproof phone. If I'm in a foreign country, there's another one of those (my previous phone) in my backpack. It's far more reliable than paper maps, especially since the electronic map is more likely to be up to date with detours. No cell signal is ever needed, though it makes GPS locks faster.
This is why I don't settle for phones with no microSD card. These maps are huge.