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 Lumia phone have expandable memory?
- How do I know if an app or service is using my location info on my Lumia phone?
- Why my Bluetooth headset does not ring using the same ringtone as my Lumia phone?
- Where can I get support for the HERE apps?
- Which Wireless LAN (WiFi) security standards are supported on my Lumia phone?