In the original version of my previous post, NYA Split and Bitcoin Gold, I mentioned that Jaxx.io would be a good option for mobile storage.
I no longer recommend storing any Bitcoin in a Jaxx wallet.
Jaxx supports the 2x hard fork. If any readers have Bitcoin stored with Jaxx I highly recommend removing your coins before the 2x fork.
Paper wallets and hardware wallets are the best methods for safe long-term storage. I will have more information regarding storage in an upcoming post.