A really useful feature in case you want to receive a warning notification before you use all of the mobile data available according to your mobile provider contract. It's a great way to avoid additional charges.
Let me show you how to add a Google account to a Samsung Galaxy SIII so you can read you Gmail email, download apps from the Play Store and synchronize you Google Documents.
Let me show you how simple is is to turn your Samsung Galaxy S3 into a wireless hotpot you then connect to with any other WiFi device and surf the Internet.