Your phone number must be activated with your Bank account before you can purchase airtime via it. Below are the codes for all the banks: 1. Access bank: *901* amount# 2. Ecobank: *326*amount# 3. Fidelity: *770*amount# 4. FCMB:*389*214*amount# 5. First Bank: *894*amount# 6. GTB: *737*amount# 7. Heritage bank: *322*030*amount# 8. Keystone: *322*082*amount# 9. Skye bank: *389*076*1*