The new OneDrive system is compatible with both tablets and mobiles.
You will have to download the various Microsoft apps through the app store to give your phone the capability to open Word documents or PowerPoints. Once you possess them you will also require OneDrive so that you can access your documents and save them in a secure location.
You can save files to your device so that you can use them offline and with the other Microsoft apps you will be able to work on your work from any location or at any time.
Your phone is an easy way to add photos and videos into your one drive. However without WiFi this could put a strain on your devices mobile plan. You can set it so that photos will only ever upload or save when on WiFi.
Go to Me, Settings and 'Camera Upload' from here you can choose whether uploads occur on WiFi only or if they work on both WiFi and Mobile Networks.