Here’s a video showing the Datasense app in action on the Lumia 925. Datasense is a built-in app which lets you monitor your data usage and thereby helps in saving yourself from huge bills after the end of month. Datasense also allows you to limit your data usage and check which apps are sucking up their data allowance and even find free WiFi hotspots available nearby.
Datasense was previously only available to Verizon users, but the things are changing with the upcoming update. Nokia Lumia 925 already makes it available to all the users and will soon reach other Lumia (indeed all WP) devices via the upcoming GDR2 (amber) update.
Source – AAWP