How to check internet balance in internet packages offered by mobile operators in Bangladesh

To check Grameenphone internet balance just dial *567#
       
To Check Banglalink internet balance just dial *5000*500#.

 To Check Robi internet balance just dial *8444*88#
 
To Check Airtel internet balance (Prepaid) just dial *778*555#
        To Check Airtel internet balance (postpaid) just dial *121*70#
        To Check Teletalk internet balance just dial *152# or write U send to 111.