HOW TO KNOW YOUR OWN MOBILE NUMBER (GRAMEENPHONE, BANGLALINK, ROBI, AIRTEL)

If you find your lost sim but cannot remember the number you can get it very easily! It does not require any balance. You can get the number by simply dialling a code.
Following are the hidden codes:
Grameenphone= *2#
Banglalink: *511#
Robi= *140*2*4#
Airtel= *121*6*3#