I just purchased a ticket today using an e-credit. It no longer needs to be done on the phone. You go to the reservation page to book a flight and towards the bottom you will see use voucher or ecredit, clcik on that and choose your voucher and then go and choose your flights, etc. Once this is done, it will apply the voucher towards the credit and then create a new credit for the remaining amount, which you can use the next ticket. I have several small credit, 4.31, 65.20, 73,.40 etc which are remaining balances from old vouchers.