There are five mobile operators in Bangladesh. These operators are currently providing the sim card services through out the country. These operators are

Gp – Grameenphone
Robi - Previous Aktel
Airtel- Priviously Warid
Teletalk – Only State owned Telecom Company
Banglalink

It is important to remind the own number. But in the era of Mobilephone operator, most of the people have several sim cards. It is somewhat tough to remember the number of a sim. As there are no visual difference between two sims from same operators.

Mobile phone operators provide the facility to check your own number. You have to simply dial the following code according to your operators.