How to check balance in GP, Teletalk, Banglalink ,Airtel, Robi, Citycell

How to check balance 

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To check the account balance press:

For GrameenPhone Press *566#

For Airtel Press *778#

For Robi Press *222#

For Banglalink Press *124#

For Teletalk Press *152#

For Citycell Press *811