With voucher Top-ups, you can top-up by activating a voucher code. You can buy a voucher code from any Three store or UK shop that has a green Top-up logo.
With voucher Top-ups, you can top-up any Three number. If you're feeling generous, you can even buy credit for your friends or family. Check out 'Topping up another number' below to see how it's done.
Just make sure you use your code within 90 days of purchase, otherwise it'll expire. And bear in mind, you can't buy vouchers abroad.