There are lots of website that they offer to send free SMS in bangladesh. But few of them are real, I got one site from where you can send free sms to any operator of Bangladedsh like Grameen Phone(GP), Aktel, Warid, Banglalink (Not only Citycell).
Free SMS Worldwide
U can send sms but the restriction is “U can Send One SMS per day”
(Keep the promotional code as KH3AW for getting 2 SMS bonus!)
Some Steps to become able to send free SMS:
1. Register with Your Valid Phone Number
2. They will sent you an activation code, use the activation code to register
3. Complete your Profile information (Very important to get free SMS)
4. Upload one of your picture as profile pic (Very important)
5. Connect your profile with Facebook connect to get 1 free SMS daily..
Then Happy Free SMS ing..