Boxing Day Sales: The best iPhone 6S deal for Boxing Day: Save £100 using the code TRXMAS64

If you're looking for a new iPhone 6S, we've got a cracking Boxing Day deal for you. Using the voucher code TRXMAS64 you can save £100 on the upfront cost of the superior 64GB version of the iPhone 6S and bag yourself what is undoubtedly the best iPhone deal in the UK right now. It might even be the best deal on the planet.

After the £100 discount you'll pay just £75 for the phone instead of £175 and it comes with a great 4G contract from O2: £31 per month for unlimited calls and texts and 3GB data. If this deal sounds familiar it's because this is the very deal that set the web alight on Black Friday back in November. Back then it only lasted a few days - it was so popular that stock ran out and the deal had to be withdrawn.

But now the deal is back for a very limited time, and it really is the deal to go for right now. It's even cheaper than the best deals on the 16GB version, and 3GB data is more than enough for the majority of people. What's not to like?

The UK's best iPhone 6S deal in full:

It's available in most colours – Space Grey, Silver and Gold – and it works out cheaper than even the best deal on the inferior 16GB version.

iPhone 6S 64GB | ~~£175~~ £75 up front | Unlimited calls | Unlimited texts | O2 4G | 3GB data | £31pm | £819 total
Use the Christmas voucher code TRXMAS64 at the checkout to save £100 on the superior 64GB version of the iPhone 6S and pay £75 upfront instead of £175. Then you'll be on a 4G contract with O2 which offers unlimited calls and texts and 3GB data for £31 per month. Total cost of this deal over two years is £819.

Another iPhone 6S deal if you need more storage:

The above deal is the one we highly recommend, but if you'd prefer the 128GB version of the phone - say if you take loads of photos and videos or like to download a lot of apps and other content onto your phone - this is also a great deal. It's the same as above but £150 up front for double the storage capacity. This one is available in all colours.

iPhone 6S 128GB | ~~£300~~ £150 up front | Unlimited calls + texts | O2 4G | 3GB | £31pm | £894 total
Use the code XMAS150 at the checkout to save £150 on the best-of-the-best iPhone 6S 128GB handset and pay just £150 up front instead of £300. Then you'll be on a 4G contract with O2 which offers unlimited calls and texts and 3GB data for £31 per month. Total cost of this deal over two years is £894.

iPhone 6 Plus: Get the supersized iPhone 6 at a cheapest-ever standalone price - now £589 at John Lewis

Is this really such a good deal?

We would never recommend a deal to you if we didn't think it offered truly great value. We've had a look around all the big sites – Carphone Warehouse, Mobiles.co.uk, e2save.com, Mobile Phones Direct etc as well as all of the UK networks' own sites – this deal comes out in front and by a considerable margin. It's by far the best deal on the iPhone 6S 64GB and also offers far better value than the 16GB deals out there.

The next best deal on the iPhone 64GB is at Mobiles Phones Direct – but there you'll be paying £45.75 more in total (and £384.99 up front), and for just 1GB data instead of 3GB.

The absolute cheapest way to get hold of an iPhone 6S on contract is this deal also at Mobile Phones Direct – going for that deal would save you £34.75 – but you'd be getting the 16GB version of the phone instead of the 64GB version, and 1GB data instead of 3GB.

View and compare all of the UK's best iPhone 6S deals here