How to Turn Your iPhone Into a USB Thumb Drive

I used to carry a USB drive containing important files on my keychain. Just in case the drive fell into criminal hands, I encrypted the files. Unfortunately, the drive's software, which I needed to access the files, didn't always work the way it was supposed to. So I gave up.Thankfully, you don't need to carry a keychain-based USB drive anymore. All you need is a decent app to transfer files between your computer and smartphone (or tablet).Apple's iOS devices were apparently out to lunch when