How to know your own Airtel, GrameenPhone, BanglaLink & Teletalk number?

Dial *121*7*3#


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Airtel Bangladesh (016) Dial *121*6*3#
Grameenphone (017) Dial *2#
BanglaLink (019) Dial *511#
Teletalk (015) Dial *551#
Robi (018) Dial *140*2*4# Or, Dial 1200 and listen and then choose option 4