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.
- My Lumia touch screen is not responding or is responding the wrong way
- How do I reinstall paid and free applications from the Store on my Nokia Lumia phone?
- I cannot see the app update notification on Lumia phone Store tile
- The incoming audio quality is poor when in a call
- The person I am calling on my Lumia cannot hear me