I'd love to have my 60-70 gigs of music on board my phone and available at all times, not just when I have good cell coverage or wifi. Also, when I visit Canad

I'd love to have my 60-70 gigs of music on board my phone and available at all times, not just when I have good cell coverage or wifi. Also, when I visit Canada, data is suddenly super expensive. What's more, I'd like to have all my GPS maps available offline. It's very difficult situation when I've traveled to some out of the way place where I have no reception, and can't load any maps to navigate me home.