Samsung's new flagship smartphone series is now available, and it's possible to bag one with some freebies – or up to £200 off.
If you're after freebies, one of the best places to check for deals is always the official Samsung store. You can typically find appealing offers that not only include traditional discounts, but also free accessories, other devices such as Chromebooks or significant cashback on older devices – these can all dramatically reduce the upfront cost.
That said, the best deals are matched at Amazon, where you can get up £100 off a S25 or S25+. The best deal for an S25 Ultra is also from Amazon, where you can get £200 off.
Compare Samsung's current offers to the handset-only and contract deals to see which works best.
Before buying, take a look at our Samsung Galaxy S25, Galaxy S25+, and Galaxy S25 Ultra reviews to see how they did in our rigorous lab testing.
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'Average price' or 'lowest price' are based on Which? market knowledge and information supplied by our partners. Average price and lowest price are checked for the six calendar months prior to publication. Not all retailers are included in our checks.
Best Samsung Galaxy S25 Sim-free deals
Average price in the last six months £799.99 | Lowest price in the last six months £599
Samsung Galaxy S25
Get cash back when trading in an old smartphone through Samsung. Currently, trading in a S24 Ultra will get you up to £540 off. Additionally, using code 'SAVES25' at checkout will get you £100 off – this brings the price of a new S25 down to £699.
You'll also get three free months of Samsung Care+ free, and 30% off devices like a Galaxy Watch7 or Galaxy Buds3 if you bundle these with a phone.
While Samsung drives a hard bargain, Amazon matches the money off. You can get a S25 for £699 with automatic savings at checkout. Back in February, you could get an additional £100 if you had a Prime Student account, but sadly this deal is over.
See below for the most up-to-date prices on this model from retailers:
Best Samsung Galaxy S25+ Sim-free deals
Average price in the last six months: £999 | Lowest price in the last six months: £799
Samsung Galaxy S25+
The S25+ is a bigger version of the stock S25 – its screen is half an inch larger and it has a bigger battery.
On the whole, deals are similar to the standard S25; you'll get extra cash back on a trade-in when you buy from Samsung, plus £100 off using code 'SAVES25' at checkout. You can also get 30% off other tech when you bundle it with a S25+.
If you buy from Amazon, you'll get £100 off with a coupon that's automatically applied at checkout.
Compare prices on a S25+ from retailers below:
Best Samsung Galaxy S25 Ultra Sim-free deals
Average price in the last six months: £1,249 | Lowest price in the last six months: £1,049.
Samsung S25 Ultra
Being the highest-spec phone in the range, the S25 Ultra will set you back a pretty penny. That said, we did spot a few bargains.
When you buy an S25 Ultra from Samsung, it's a similar deal to the other S25 models – extra cash back with a trade-in, 30% off other devices when you build a bundle, three months of Samsung Care+, and £100 off with code 'SAVES25'.
In terms of discounts, the best deal is from Amazon – which is offering £200 off a new S25 Ultra that's applied automatically at checkout.
Compare prices below on this model:
If you'd rather sign up for a mobile contract, you can view available Sim-free deals and plans using our Which? mobile phone switching service.
Best Samsung Galaxy S25 contract deals
There are hundreds of contract deals for the Galaxy S25 range and they change all the time. Some will include extras, like Sky Mobile throwing in a free Galaxy Watch7, or O2 giving out six months' access to Disney+.
The key to getting a good deal is knowing how to work out the total cost so you can compare all options. You can use our phone contract calculator below for any deals you're weighing up – be sure to add in the cost of any extras you're after, too.
You should also keep the following in mind before you take the plunge:
Check the period over which you'll pay off the handset. Many providers offer 48-month repayment plans, which can make the monthly cost appear miniscule, but may not actually save you money in the long term.
Find out how much the Sim price may rise after the first year, and remember you can switch the Sim part of the deal after the two years are up (see our top Sim deals below).
Watch out for upfront costs, and look out for other ways to save, such as trading in an old phone for money off a new device.
Compare contract deals on theSamsung Galaxy S2 5, theGalaxy S25 Plus and theGalaxy S25 Ultra and use our calculator to work out total cost
Should I buy a Galaxy S24 instead?
With Samsung's new line of phones coming out, you can pick up a last generation S24 for a significant discount. For example, you can find a S24 Ultra for half the price of a S25 Ultra. Take a look at our page on the best S24 deals to help you find a great bargain and compare prices on models.
Best Sim-only deals
Getting a Sim-only deal for your handset can be a great way to get stacks of monthly data and calls allowance for a lot less. Here's our pick of some of the best low, medium and high-data deals.
people trying out smartphones
Best low-data Sim deal
There are a range of low-data deals available at rock-bottom prices from rival networks to the traditional 'big four'. Here's our current pick:
Best medium-data Sim deal
If you need a bit more data each month, but still have access to wi-fi frequently, this is a good price on a Sim that will deliver when you're untethered from a router:
Best high-data Sim deal
If you're going to be streaming shows on the train or while you're on the go, a high-data Sim deal will help you make sure you don't go over your allowance:
Not found one that's quite right for you? Browse all the best Sim-only deals on Which? Switch Mobile
Why you can trust our mobile phone tests
Galaxy S25 smartphones
We buy every mobile phone we test anonymously to make sure it's the same product that you buy – and to keep our results impartial.
Our phones go through more than 40 different tests in lab conditions. Our camera testing is in depth – from overall picture quality in daylight conditions, to evaluating colour accuracy, image stabilisation and the quality of the optical zoom. We use a robotic arm to interact with the phone to measure its battery life through the day at different brightness settings, and we test how long it takes to charge. We benchmark the speed of each phone's processor to compare it to others on the market, as well as putting it through daily tasks to make sure you don't end up with a sluggish performance.
For your peace of mind, we also test if the phone is durable enough to survive getting caught in the rain or being dropped on hard surfaces. Read more about how we test mobile phones.
Love a bargain? Bookmark our guide to the best mobile phone and Sim-only deals to see our top picks each month