Salkey

Hmm, looks a bit inconvenient to have to carry a USB stick around, especially considering many Android phones come with a MicroSD slot. It'd also require some more dev work on iOS, since it doesn't support OTG without a specific app. Even then Apple has to accept it.

Sounds hopeful, but not much use for those of us still on KitKat

It's not currently possible, to the best of my knowledge.

I would like to add my voice - my cheap phone's cosy 2GB internal memory (well, 4GB, but Android takes 2GB) is not enough for my frequent usage of Evernote, especially when attaching PDFs and high-res images. Equally, my cheap contract of 500mb/month is not enough to download my notes on the fly. Considering Evernote premium allows 10GB of notes/month, it's easy to see why this is an issue. As for security concerns, I don't see why the notes couldn't be stored in an encrypted file on the SD card. Surely this is just as safe as on the internal memory? Even if this isn't possible, it would be nice to have the choice - personally, I do not worry over the security of my German notes, provided they are always there.