The service offer for the newly introduced pre-paid scheme    Card Type Price (Tk.) Credit Limit Validity Registration 90 Up to 150 min. 1 Month Card Type ( Refill ) Usage Rate / min Credit Limit Validity 8am - 11pm 11pm - 8am Minimum Maximum   Copper [ Tk. 100 ] 50 paisa 25 paisa 200 min. 400 min. 6 months   Silver [ Tk. 300 ] 50 paisa 25 paisa 600  min. 1200 min. 6 months   Gold [ Tk. 500 ] 50 paisa 25 paisa 1000 min. 2000 min. 6 months   Platinum [Tk. 1000] 50 paisa 25 paisa 2000 min. 4000 min 6 months