From this post you will get the complete tricks to configure banglalink on your device.
Automatic Banglalink Internet Configuration
Go to message option and write ALL and send it to 3343
After that you will sent an SMS with activation process.
Manually Banglalink internet activation
You can also doing it by manually change your device configuration option. Go to setting>mobile-internet and add this below given information.
Banglalink WAP Setting:
APN(Access Point Name): blwap
Banglalink MMS Setting:
APN(Access Point Name): blmms
Banglalink INTERNET Setting:
Connection/Profile: Banglalink-WEBHope that you would like this post and successfully configure net on your device.
APN(Access Point Name): blweb