You need to wait for a firmware update to your phone and then accept Extras+info app update. The extras+info app update installs the Storage Check app to the Lumia device. It will be visible in the Settings menu.
- Does my Nokia Lumia use an IP address when it accesses data networks?
- Can I use my Nokia Lumia as a tethered modem for my laptop?
- What is OneDrive?
- I cannot connect to the internet using a mobile data connection on my Lumia (Windows Phone 7)
- I cannot send or receive multimedia messages on my Lumia (Windows Phone 7)