to automatically connect to the cellular data network when it is available. Clear the check box to manually connect each time you want to use the cellular data connection.
The name of the mobile operator appears below the Cellular network icon.
If prompted, type your user name, password, and access point name (APN).
If the Cellular quick action is turned off, select it to turn it on. When off, the cellular radio is turned off, and you cannot connect to a cellular network.