Hello World. "Dropbox is a free service that lets you bring all your photos, docs, and videos anywhere. This means that any file you save to your Dropbox will automatically save to all your computers, phones and even the Dropbox website."
I found it useful since it lets me sync my files with my laptop and mobile phone (I am using android!). You want an app for your phone? Access it here!
Initially it gives you 2GB of storage plus 250MB every referrals (so it will be up to 8GB).
It's nice and free! Why not check it out and simplify your life!