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Compare Samsung Galaxy S25 Ultra Deals

Compare the latest Samsung Galaxy S25 Ultra deals from 4 UK networks. Filter by data, contract length and upfront cost, and plant trees with every switch.

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117 deals
Galaxy S25 Ultra 256GB Titanium Whitesilver

Galaxy S25 Ultra 256GB Titanium Whitesilver

iD Mobile · White

Trees planted
£35.99
a month
Price rises
£37.79 from 1 April 2027
£39.59 from 1 April 2028
100GB
data
£19
upfront
24 month
contract
4G
network
Get deal
Galaxy S25 Ultra 256GB Titanium Silverblue

Galaxy S25 Ultra 256GB Titanium Silverblue

iD Mobile · Blue

Trees planted
£35.99
a month
Price rises
£37.79 from 1 April 2027
£39.59 from 1 April 2028
100GB
data
£19
upfront
24 month
contract
4G
network
Get deal
Galaxy S25 Ultra 256GB Titanium Black

Galaxy S25 Ultra 256GB Titanium Black

iD Mobile · Black

Trees planted
£35.99
a month
Price rises
£37.79 from 1 April 2027
£39.59 from 1 April 2028
100GB
data
£19
upfront
24 month
contract
4G
network
Get deal
Galaxy S25 Ultra 256GB Jet Black

Galaxy S25 Ultra 256GB Jet Black

iD Mobile · Black

Trees planted
£35.99
a month
Price rises
£37.79 from 1 April 2027
£39.59 from 1 April 2028
100GB
data
£19
upfront
24 month
contract
4G
network
Get deal
Galaxy S25 Ultra 256GB Titanium Grey

Galaxy S25 Ultra 256GB Titanium Grey

iD Mobile · Grey

Trees planted
£35.99
a month
Price rises
£37.79 from 1 April 2027
£39.59 from 1 April 2028
100GB
data
£19
upfront
24 month
contract
4G
network
Get deal
Galaxy S25 Ultra 256GB Titanium Grey

Galaxy S25 Ultra 256GB Titanium Grey

iD Mobile · Grey

Trees planted
£37.99
a month
Price rises
£39.79 from 1 April 2027
£41.59 from 1 April 2028
400GB
data
£19
upfront
24 month
contract
4G
network
Get deal
Galaxy S25 Ultra 256GB Titanium Whitesilver

Galaxy S25 Ultra 256GB Titanium Whitesilver

iD Mobile · White

Trees planted
£37.99
a month
Price rises
£39.79 from 1 April 2027
£41.59 from 1 April 2028
400GB
data
£19
upfront
24 month
contract
4G
network
Get deal
Galaxy S25 Ultra 256GB Titanium Silverblue

Galaxy S25 Ultra 256GB Titanium Silverblue

iD Mobile · Blue

Trees planted
£37.99
a month
Price rises
£39.79 from 1 April 2027
£41.59 from 1 April 2028
400GB
data
£19
upfront
24 month
contract
4G
network
Get deal
Galaxy S25 Ultra 256GB Jet Black

Galaxy S25 Ultra 256GB Jet Black

iD Mobile · Black

Trees planted
£37.99
a month
Price rises
£39.79 from 1 April 2027
£41.59 from 1 April 2028
400GB
data
£19
upfront
24 month
contract
4G
network
Get deal
Galaxy S25 Ultra 256GB Titanium Black

Galaxy S25 Ultra 256GB Titanium Black

iD Mobile · Black

Trees planted
£37.99
a month
Price rises
£39.79 from 1 April 2027
£41.59 from 1 April 2028
400GB
data
£19
upfront
24 month
contract
4G
network
Get deal
Galaxy S25 Ultra 256GB Jet Black

Galaxy S25 Ultra 256GB Jet Black

iD Mobile · Black

Trees planted
£38.99
a month
Price rises
£40.79 from 1 April 2027
£42.59 from 1 April 2028
Unlimited
data
£19
upfront
24 month
contract
4G
network
Get deal
Galaxy S25 Ultra 256GB Titanium Black

Galaxy S25 Ultra 256GB Titanium Black

iD Mobile · Black

Trees planted
£38.99
a month
Price rises
£40.79 from 1 April 2027
£42.59 from 1 April 2028
Unlimited
data
£19
upfront
24 month
contract
4G
network
Get deal

Mobile deal data is fetched live from our data platform each time you search or filter, so listings reflect the latest information networks have supplied. Prices and offers can change and may occasionally differ on the network's own website; the network's checkout price is the one that applies. Coverage and speeds vary by network and location, so check Ofcom's mobile coverage checker before you switch. We compare deals from a significant share of the UK market, but no comparison site covers every deal from every network. See how we compare for the networks we include and how results are ranked.

About the Samsung Galaxy S25 Ultra

The Galaxy S25 Ultra is Samsung's flagship for 2025, built for people who want the best camera and screen the range offers. It runs Android 15, packs a 6.9-inch LTPO AMOLED 2X display and a 200MP camera, and includes a stylus. Deals start from £13.00 a month.

Key takeaways

  • 6.9-inch LTPO AMOLED 2X display, the largest in the range
  • 200MP main camera plus a 12MP selfie lens
  • Samsung stylus included for notes and precise edits
  • 5000 mAh battery to last a full day
  • Storage up to 1024GB, but no card slot

Samsung Galaxy S25 Ultra specifications

Display
6.9-inch (3120 x 1440)
Storage
256GB / 512GB / 1024GB
Main camera
200MP
Front camera
12MP
Battery
5,000 mAh
5G
Yes
Operating system
Android 15
Weight
218g
Memory card
No
Released
January 2025

Key features

  • 6.9-inch Dynamic LTPO AMOLED 2X
  • 200MP main rear camera
  • 12MP selfie 
  • Stylus included

How to pick your Galaxy S25 Ultra deal

Start by deciding the storage you need, since that decision is locked in for the life of the phone. From there, two numbers shape the cost: the monthly price and any upfront charge. Deals with a small monthly figure often carry a larger upfront fee, so sort by effective monthly cost to compare them fairly. Choose a data allowance that fits your real usage, and remember a SIM-only plan can be cheaper if your current phone is still going strong.

Camera and display

The 200MP main camera is the headline act, capturing crisp, detailed shots in good light and holding its own once the sun goes down. A 12MP selfie lens keeps faces sharp on video calls. The 6.9-inch LTPO AMOLED 2X panel is the biggest and most advanced screen Samsung fits to the range, with the LTPO tech adjusting smoothly for both film and scrolling. The bundled stylus turns it into a notepad whenever you need one.

Performance and battery

As the top model in the 2025 line-up, the S25 Ultra breezes through demanding apps, heavy multitasking and graphically rich games. The 5000 mAh battery is sized to carry most users from morning to night without anxiety. It launched on Android 15, and Samsung's update history points to several years of new software ahead. Day to day, it simply does not feel stretched.

Galaxy S25 Ultra vs Galaxy A26

The Galaxy A26 sits in Samsung's budget-friendly A range, covering the everyday basics for far less money. The S25 Ultra is a different proposition entirely: the 200MP camera, the bigger 6.9-inch screen and the included stylus all push it well above mainstream territory. Pick the A26 if value matters most and your needs are simple. Pick the S25 Ultra if you want flagship power and the best Samsung camera on offer.

How much storage do you need?

You can choose 256GB, 512GB or 1024GB, and there is no card slot to add more afterwards. 256GB works for most people. Step up to 512GB if you film a lot or keep games installed, and the 1024GB option exists for those who treat the phone as their main store of photos and video.

Pros

  • Largest 6.9-inch LTPO AMOLED 2X screen in the range
  • 200MP camera for high-detail photos
  • Stylus included as standard
  • Storage up to 1024GB

Cons

  • No memory-card slot despite the high ceiling
  • Top storage tier adds a fair amount to the price
  • Flagship pricing puts it beyond casual buyers

Our verdict

The Galaxy S25 Ultra is the phone to buy if you want Samsung's best camera, biggest screen and the bundled stylus, and you are happy to pay flagship money for them.

Get your Samsung Galaxy S25 Ultra deal in 3 steps

Choose your deal

Select your ideal Samsung Galaxy S25 Ultra from trusted retailers. Filter by data, price and contract length to find your perfect match.

Get your PAC code

Keep your current number by texting 'PAC' to 65075. It's free and takes minutes.

Complete your order

Finish your application with your chosen retailer. Your new Samsung Galaxy S25 Ultra will be delivered and your number transferred automatically.

Read our full guide to switching and keeping your number

Eco impact

Our impact grows with you

Every successful switch through Switchity plants two trees through our verified reforestation partner, Ecologi. A mature tree takes up about 22 kg of CO₂ a year, according to the European Environment Agency. Once grown, the 450 trees our switchers have funded could absorb around 9,900 kg of CO₂ a year.

450 / 1000 trees45% to goal
Verified reforestation partner: Ecologi
Best Environmentally-Focused Comparison Platform 2026, SME News
2
Trees per switch
9,900 kg
CO₂ a year, once grown

Samsung Galaxy S25 Ultra deals: FAQs

Ready to switch?

Pick your Samsung Galaxy S25 Ultra deal from the comparison above, or browse every mobile phone deal we cover.

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At a glance

Live figures from the deals on this page.

£13.00/mo
Samsung Galaxy S25 Ultra deals from
117
Deals to compare
4
Networks to choose from

Figures come from our live deal feed for this page and change as deals change. Phone deals can also have an upfront cost.

Claudia Constantin
Written by Claudia Constantin, Co-Founder & Managing EditorPublished