Call it a reward, call it an incentive, call it a bribe. To be honest, you can call it what you like – all we know is that if you sign up for BT Infinity fibre broadband by midnight on Thursday June 8, you'll be sent a £150 Reward Card.

It only takes a quick perusal of our broadband deal comparison chart to see that this deal makes BT Infinity effectively the cheapest way to get high-speed broadband right now. Once you've paid the £59.99 activation and Smart Hub delivery fee, monthly payments for BT Unlimited Infinity 1 are only £28.99. Once you take the £150 bonus into account, that means you'll pay just a tad more than £250 over the course of the one-year contract. That's exceptional, considering that BT Infinity runs speeds of 52Mb – equivalent to around 6.5MB per second. Rapid.

If you need even more speed, then the £150 Reward Card is also available on BT Unlimited Infinity 2, which delivers speeds of up to 76Mb. The tariff rises to £41.99 a month, with a reduced upfront set-up charge of £19.99. And don't fear if fibre isn't yet available in your area… BT hasn't forgotten about you. You'll receive a £100 Reward Card with the 17Mb BT Unlimited Broadband, for which you'll pay £23.99 a month after a £9.99 router delivery charge.

What is a BT Reward Card?

The Reward Card that BT sends out is a pre-paid credit card that you can use anywhere that accepts Mastercard. In short, that's around a million shops, cafes and restaurants around the world, so you shouldn't find it difficult to find places to spend, spend, spend.

It's an old-fashioned chip and pin card, rather than contactless. But do make sure that you claim your Reward Card within three months of signing up to BT, otherwise you'll lose out on all that cash.

Best broadband deals

If you're still um-ing and ah-ing over whether to go for one of these BT broadband offers, or if you want to see what other TV or phone options there are, then check out our dedicated BT broadband comparison chart below. And if you want still more internet alternatives, then head on over to our main broadband deals comparison page.