Airtel Bangladesh Number check (016) Dial 1216*3#
Grameenphone Number check (017) Dial *2#
BanglaLink Number check (019) Dial *511#
Teletalk Number check (015) Dial 551#
CityCell Number check (011) Type MDN & send it to 7678
Robi Number check (018) Dial 14024# Or, Dial 1200 and listen and then choose option 4