If you are Indian Data card user, having data card of micromax, beetal,huwai,zte we have always option to check your balance on windows OS as they provide software for that but what about Linux. I accept the pleasure of using that software is quite awesome but still we can check our data card balance on linux using a free app called Prepaid Manager.
First Install Prepaid Manager. Installing will not let you to use these app. You have also install a configuration file in which all settings are there called serviceproviders.xml
First Install libxml2-utils
sudo apt-get install libxml2-utils
if faile use command su instead of sudo.
open file manager in admin mode
or sudo namo .....
whatever your file manager is
and search for serviceproviders.xml open in text editor
look for your service provider.
where to search this file
First Look for your operator like Aircel, Vodafone, Relaince .....
Example of Aircel
and add before <apn></apn> tag
Save the file and use Prepaid manager software.