BT's Biggest Ever Mobile Sale: these are the best discounts in the offer
We run the rule over the best deals in BT Mobile's new sale, which they're calling their biggest ever. How big is big? We find out. Last updated: 14th September 2018.
BT Mobile sale in a nutshell
Every type of mobile deal that BT sell is in their new sale
September is always a big month for people changing their mobile deals, so BT are have launched a brand new set of offers to entice you to join their network.
They're calling it their biggest ever, because it includes practically every type of plan BT Mobile sell, including smartphone contracts and SIM only deals, plus their popular Family SIMs.
The sale itself is a mix of extra data offers and straight-up cash discounts, lasting throughout most of the month up until September 27th.
In the guide below, we pick through each type of product in the sale and find which are the most valuable in terms of savings they get you and how they stack up with the competition.
Useful link: See all the offers on BT's official website
SIM only plans in the sale
Half of BT Mobile's SIM only deals are in the sale

Save
up to
£24
a year
✔ Order online and get a Reward Card tooSee all BT's SIM offers
at BT.com
(opens in new window)
For their 'biggest ever sale', BT Mobile's have applied different offers for each of their SIM only plans. Sometimes it's discounts, other times it's extra data.
Below, we've ordered the deals based on how competitive we think each one is compared to other mobile networks, and the size of the saving you get vs BT's regular SIM only pricing.
The real power of the sale lies in combining on-sale SIMs with BT's Reward Card offers too. So keep an eye out below for the reward value you get with each plan.
Useful link: See BT Mobile's full SIM only range
Each of these SIM only plans is in the sale
We've put these in order of how highly we rate the deal:
✔ 4GB of extra data on BT's £15 SIM
If you have BT Broadband, you can get 10GB of monthly data for a very-competitive £15 a month:
✔ Save £24 a year on BT's 6GB SIM
If you have BT Broadband, you can get 10GB of monthly data for a very-competitive £15 a month:
✔ Triple data on BT's 1GB 3GB SIM only deal
£10 gets you 3GB data during the sale:
✔ Save £12 a year on BT's 1GB SIM
It's only £1 cheaper a month but a saving is a saving:
Phone contracts
Quadruple data: 24GB for the price of 6GB on these models
BT's "biggest ever sale" is probably biggest when it comes to phone contracts. The majority of handsets in the promotion have a quadruple data on their 6GB 24GB plans.
While extra data isn't money-off in the direct sense, it does mean you can get a massive load of data at a cheaper price than you would have otherwise had to have paid (the saving varies per phone).
You can also combine the sale with a £70 BT Reward Card on the quadruple plan.
Here are just some of the more-popular models that have quadruple data:
Samsung Galaxy S9, Galaxy S8, Galaxy S7
Useful link: See prices of every single mode in the offer
3 months half price on most other smartphones
All the rest of the phone models in BT Mobile's range (apart from iPhone X, iPhone 8 Plus and the Samsung Galaxy S9 Plus) are in an offer that gives you 3 months half price.
Take the 1GB plan on any of the remaining devices and you'll get the 3 months at 50% of the usual cost.
The biggest saving is on the Samsung Galaxy A6, which you can now get for £11.50 a month for your first 3 months of a 24-month contract. That's a saving of £34.50.
It's also worth noting each of these models lets you claim some of the largest BT Reward Cards we've ever seen them offer. So the overall value of the sale adds up quickly.
Useful link: See all pricing and phone models







