It's back! After a couple of months of us yearning, BT has reintroduced its hottest reward card offer. Sign up for BT Infinity fibre broadband by midnight on Thursday July 27 and you'll be sent a pre-paid £150 Mastercard. That makes this the best superfast fibre broadband deal out there right now.

Infinity 1 costs £29.99 per month – anything less than £30pm for 52Mb speeds is A-OK in our book. And unlike its previous bumper cash card offers, BT hasn't compensated by hiking up its activation fees this time. The upfront cost remains at £34.99, which accounts for set-up and delivery of the BT Smart Hub router.

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 a rather lofty £49.99pm however. And if fibre isn't yet available in your area, BT hasn't forgotten about you. You'll receive a £75 Reward Card with the 17Mb BT Unlimited Broadband, for which you'll pay £26.99 a month after a £9.99 router delivery charge.

  • Discover the best superfast fibre broadband deals around

Deal of the week: BT Unlimited Infinity 1 fibre broadband

BT Unlimited Infinity 1 fibre broadband | 12 months | Up to 52Mb | Weekend calls | No TV | £34.99 upfront| £29.99pm
If you're just coming to the end of your broadband contract or want to crank things up to superfast fibre, then this BT offer has come along at precisely the right time. 52Mb (6.5MB per second) is about 50% faster than most other providers' entry-level fibre speeds. And that almighty £150 Reward Card makes the whole deal the equivalent of less than £250 for the year. Bargain! Total cost of 12 months £394.87

View this BT Infinity broadband deal of the week

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 BT broadband deals page – our bespoke price comparison table will help you choose, with packages that include unlimited calls and BT Sports subscriptions. And if you want still more internet alternatives, then head on over to our main broadband deals comparison page.