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We guide you through the best SIM only offers in each UK mobile network's January Sale for every data requirement, budget and provider. Last updated: 5th January 2023
We'd say the post-Christmas period is the second best time in the year to get a bargain on a new SIM only plan (after Black Friday). And loads of networks have their January Sale offers live.
See our best-rated deals here, where we find the best offers per data amount
See offers by mobile network here, if there's a particular provider you want to join
We hope you enjoy our guide and find a great deal.
We've broken down the best deals into categories:
It's the two cheap providers on Three's 5G network dominating this category. We've got a hidden deal here from SMARTY:
Or iD have a 3 months half price offer in their sale but with a much longer commitment:
You can claim a £100 pre-paid Mastercard with O2's unlimited data deal here:
This is a decent price from Vodafone's Big Winter Sale and ends on 26th January:
If a network's not here, it's because they don't do unlimited data:
Useful link: Compare all unlimited data plans here
We think the best deal for this category is Talkmobile's 100GB deal below on Vodafone's full 5G network. It's a hidden deal and beat their own Winter Saver offers:
iD Mobile's 3 months half price sale makes this deal competitive too on the Three network:
This is worth a mention on O2 too:
Here are each UK network's best SIM only plans with 100GB or more data. If their unlimited plan is still cheaper, we'll include it here:
Useful link: Compare all plans
Once again, Talkmobile are leading on price with their hidden 1-month deal here:
Unlimited minutes + Unlimited texts + 30GB data (5G) = £7.95 a month (1‑month contract)
See full deal
But Three can get pretty close on this longer plan:
This is a great value way to get on Vodafone, with some handy cashback you don't have to claim:
These are the best current SIM only plans on each network with 30GB or more data. If they've got a plan with more than 30GB that's still cheaper, we'll include it here:
Useful link: Compare all plans
You can basically take your pick for which network to join, for more or less the same price. Talkmobile on Vodafone's 5G lead the pack by 5p:
Unlimited minutes + Unlimited texts + 12GB data (5G) = £6.95 a month (1‑month contract)
See full deal
On Three's 5G network, you've got SMARTY here:
To get on O2, have a look at Virgin Mobile:
Or to get on EE's 5G network, we think this 1pMobile deal is excellent:
These are the best SIM only offers available from each network with 10GB or more data. If there's a cheaper deal that comes with more, we'll show that instead:
Useful link: Compare all plans
It's now possible to spend as little as £6 to get more than 5GB of data. Talkmobile on Vodafone's 5G once again win on price by 5p:
Or for an O2-based network, try Virgin Mobile:
Or to get on Three's 5G network, iD Mobile have got an excellent price here:
These are the best SIM only offers available from each network with 10GB or more data. If there's a cheaper deal that comes with more, we'll show that instead:
Useful link: Compare all plans
What Three are billing as their Winter Sale offers have actually been live for a while. You'll get 6 months half price on these 24-month plans.
While that's well and good, we can beat the average monthly cost of those deals with Three's hidden plans below, on shorter contracts:
Useful link: Our Three review
EE's Winter Sale is live, with half price offers for 3 and 6 months on their 24-month SIMs. The best deal is their unlimited plan here:
If you're in the market for a smaller data plan, 1pMobile on the full EE 5G network have a very good 1-month deal here:
Useful links: Our EE review | Our guide to Flex Plans
giffgaff never really go in for seasonal offers on their SIM only plans but they have just improved what you get with a whole load of regular plans. Plus they won't raise prices this year.
Here are the standout deals on giffgaff:
Useful link: Our giffgaff review
If you're feeling the effects of an expensive Christmas, iD Mobile's Winter Sale could help you out. There's 3 months half price on loads of plans.
Here are the best value:
Useful link: Our iD Mobile review
O2 have probably got their best January Sale offer for years. You can claim a pre-paid Mastercard loaded with up to £100 on it. You do have to claim though, within 90 days (they text you how).
Claim a £100 on their unlimited deal:
Or one with £50 on this:
Unlimited minutes + Unlimited texts + 150GB data (5G) = £22 a month (24‑month contract)
See full deal
Useful link: Our O2 review
There's a nice simple offer on all Sky Mobile's SIMs as part of their Winter Sale: get 25% off whatever plan you choose. For us, the most competitive deals are these:
Unlimited minutes + Unlimited texts + 4GB data (5G) = £8 £6 a month (12‑month contract)
See full deal
Useful link: Our Sky Mobile review
As usual, there are loads of offers on SMARTY, some of which are hidden deals they've shared with us for our readers. Here are the best ones:
Useful link: Our SMARTY review
On Talkmobile's 12-month contracts, they've applied some Winter Sale pricing. But we've got a range of hidden 1-month deals with them with less of a commitment and lower/same pricing:
Unlimited minutes + Unlimited texts + 12GB data (5G) = £6.95 a month (1‑month contract)
See full deal
Unlimited minutes + Unlimited texts + 30GB data (5G) = £7.95 a month (1‑month contract)
See full deal
Unlimited minutes + Unlimited texts + 70GB data (5G) = £9.95 a month (1‑month contract)
See full deal
Useful link: Our Talkmobile review
There's a bit of Sale branding on Tesco Mobile but really they are just continuing with their standard offer, which sees improved pricing on certain plans if you have a Clubcard:
Useful link: Our Tesco Mobile review
At any time of year, Virgin are one of the best mobile networks for low prices but there's some extra competitive pricing in their Winter Sale including:
Useful link: Our Virgin Mobile review
You've got until 26th January to benefit from Vodafone's Big Winter Sale, which sees their full-speed unlimited data SIM reduced to £25:
Or for smaller data amounts, it's worth looking at joining via Carphone Warehouse as they'll send you free cashback on the plans below without having to claim anything:
Useful link: Our Vodafone review
Order by 26th January and you can get double data on pretty much every VOXI plan (or £5 off unlimited data). The best offers out of them are these two:
Useful link: Our VOXI review
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