We have two voucher codes for you for use with Vodafone.
Get a free mobile broadband USB dongle using voucher code PAYGMB when you buy any 18m contract costing £35 per month or above, or any 24m contract costing £30 or above. The offer includes iPhone 4.
Or, take a SIM only deal on a 12 month contract and get a free Bluetooth headset using voucher code FREEBT. Just £10 a month gives you 300 minutes and unlimited texts.
More info here…