When asked for your service type you will find this by looking at your in-home display.
If your prepayment system is 'Secure' it will say 'Secure' on the front of your in-home display.
If your prepayment system is 'Guru' it will say 'Guru' on the front of your in-home display.
If you're still unsure just give us a call and we can help you out - 0330 324 0018.