How can I check my Airtel data balance online

How can I check my Airtel data balance online?

List of All USSD Codes for Airtel:

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• Airtel USSD codes to Check Balance.
• Airtel mobile balance check code no : *123#
• Ussd code for Airtel internet balance check : 
• Airtel internet balance check Ussd code : *123*10# or *123*11#
• Airtel SMS balance check code : *123*7#
• Ussd code for Airtel 3g data balance : *123*11#

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