Easy. Just pop over to our voucher page to add credit to your account from a voucher. You can also redeem your 16 digit voucher code by calling 43430 (free) from your handset.
Or you can buy a standard plan from a voucher, instead of redeeming the voucher for credit.
Did this solve your problem? If not, pop over to our friendly community for a quick response. Or ask one of our helpful agents for an answer within 24 hours.