Use APKPure App
Get Sim Help BD old version APK for Android
इस एप्लिकेशन के आप बहुत आसानी से अपने मोबाइल सिम का उपयोग करने में मदद मिलेगी
This Application provides you some important USSD code for all Bangladeshi sim except Citycell.After running the app just choose your option and perform your expected operation.If you face any problem,please let me know by giving your feedback.Your inspiration is my power .It will make me useful to do something better