For starters, you’ll need a giffgaff top up voucher. You can buy these from most supermarkets and corner stores.
Then, dial 43430. This is an interactive service where you can redeem vouchers to add credit to your account and buy plans over the phone.
If you’re still stuck, ask our brilliant community helpers.
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.