Samsung Galaxy S25 Ultra: contract deals across networks

Unlimited data

We've analysed the unlimited data Galaxy S25 Ultra contracts available on each UK mobile network and picked out the most competitive deal on each provider. Here's the state of play for May:

We'd say the strongest deal is Three's £34 a month one here with £195 to pay up front:

Unlimited minutes + Unlimited texts +  Unlimited data (5G) =  £34 a month, £195 up front (24‑month contract)
See full deal

🛈 Increased to: £35.50 on April 1 2028.
Increased to: £37.00 on April 1 2029

Or for a next best alternative, take a look at giffgaff's unlimited data deal below at £61.50 a month:

Unlimited minutes + Unlimited texts +  Always On data (5G) =  £61.50 a month, £25 up front (36‑month contract)
See full deal

🛈 giffgaff reserve the right to increase the cost of this phone's airtime plan annually with one month's notice

While here's the best option on O2 to get the Samsung Galaxy S25 Ultra with unlimited data:

Unlimited minutes + Unlimited texts +  Unlimited data (5G) =  £70.86 a month, £30 up front (36‑month contract)
See full deal

🛈 Monthly airtime plan price will increase each April by the Retail Price Index rate of inflation published in February + 3.9%

And bottom of the pile is Vodafone's unlimited data contract here, which comes in at £73.50 a month:

Unlimited minutes + Unlimited texts +  Unlimited data (5G) =  £73.50 a month, £50 up front (36‑month contract)
See full deal

🛈 Increased to: £75.30 on April 1 2027.
Increased to: £77.10 on April 1 2028

And that's it for networks offering the Samsung Galaxy S25 Ultra with unlimited data. There may be more combos of data speed, contract length and upfront costs though, so use our comparison tool further at the top.

Useful link: Compare all unlimited data deals above

giffgaff: get the Galaxy S25 Ultra from £41.64 a month

On giffgaff, our latest search of all their deals found that the Samsung Galaxy S25 Ultra is available in Titanium Black, Titanium Grey, Titanium Whitesilver and Titanium Silverblue at the moment. Memory-wise, they've got the 256GB and 512GB versions.

giffgaff sell the Samsung Galaxy S25 Ultra on two contract lengths: 36 or 24 months but the only way to get it on their network is by joining direct, there's no option to join via any re-sellers.

giffgaff's best Samsung Galaxy S25 Ultra deals

✔ Best overall deal

We think this is currently giffgaff's most competitive plan for the Galaxy S25 Ultra:

Unlimited minutes + Unlimited texts +  Always On data (5G) =  £61.50 a month, £25 up front (36‑month contract)
See full deal

🛈 giffgaff reserve the right to increase the cost of this phone's airtime plan annually with one month's notice

✔ Unlimited data

Our favourite unlimited data deal for the Samsung Galaxy S25 Ultra on giffgaff is the one above in the best overall deal section.

Price-wise, giffgaff have contracts priced ranging between £41.64 - £93.92 a month (with £25 - £200 upfront), depending on the minutes, texts and data you want.

Useful link: Compare all giffgaff's Galaxy S25 Ultra deals

O2's Galaxy S25 Ultra contracts currently start at £57.86 a month

Looking at their latest deals in May, if you want the Samsung Galaxy S25 Ultra from O2, they've currently got it in Titanium Black and Titanium Grey. And they've only got it in the 256GB memory version.

There's three choices of contract length for the Galaxy S25 Ultra on O2: 36, 24 or 12 months but you can't get it on a contract with them via re-sellers like Carphone Warehouse, you have to join directly.

O2's best Samsung Galaxy S25 Ultra deals

✔ Best overall deal

Here's the O2 Galaxy S25 Ultra deal that stacks up best against other providers:

Unlimited minutes + Unlimited texts +  Unlimited data (5G) =  £87.79 a month, £30 up front (24‑month contract)
See full deal

🛈 Monthly airtime plan price will increase each April by the Retail Price Index rate of inflation published in February + 3.9%

✔ Unlimited data

O2's best unlimited data plan for the Samsung Galaxy S25 Ultra is the same as our overall favourite deal above.

Their contracts are priced between £57.86 - £147.57 a month, depending on amount of minutes, texts and data in the plan. And you'll pay £30 up front too.

Useful link: Compare all O2's Galaxy S25 Ultra deals

Talkmobile have 180 deals for the Galaxy S25 Ultra

Our latest search of their deals finds that Talkmobile currently have the Samsung Galaxy S25 Ultra in Titanium Silverblue, Titanium Black and Titanium Grey. And there's only a choice of one memory variant: 256GB.

You've only got one contract length choice of 24 months for the Galaxy S25 Ultra on Talkmobile and you can only get it from the re-sellers Fonehouse and Metrofone. You can't get it direct from Talkmobile.

Talkmobile's best Samsung Galaxy S25 Ultra deals

✔ Best overall deal

This is the most competitive Talkmobile plan for the Galaxy S25 Ultra, compared against other networks:

✔ Unlimited data

If you want unlimited data with your Samsung Galaxy S25 Ultra, our top-pick on Talkmobile is the same as our overall best deal above.

On a pay monthly deal, you're looking at prices between £11.95 - £31.95 per month on Talkmobile, depending on the minutes, texts and data you want. And that's with £175 - £635 upfront costs.

Useful link: Compare all Talkmobile's Galaxy S25 Ultra deals

Three's Galaxy S25 Ultra deals start from £14 a month

Looking at Three's current pay monthly contracts for May, they have the Samsung Galaxy S25 Ultra in Titanium Black, Titanium Grey, Titanium Silverblue and Titanium Whitesilver. And they stock the 256GB, 512GB and 1TB versions of it.

Three offer the Galaxy S25 Ultra on 24 or 36‑month contracts and there are contracts for it via the re-sellers Fonehouse and Metrofone, or you can join directly.

Three's best Samsung Galaxy S25 Ultra deals

✔ Best overall deal

Here's the Three deal we think is the best value at the moment for the Galaxy S25 Ultra:

Unlimited minutes + Unlimited texts +  Unlimited data (5G) =  £38 a month, £115 up front (24‑month contract)
See full deal

🛈 Increased to: £39.50 on April 1 2028.
Increased to: £41.00 on April 1 2029

✔ Unlimited data

The best Samsung Galaxy S25 Ultra plan with unlimited data from Three is the same as the one we've chosen as their best overall deal above.

Depending on the amount of minutes, texts and data you want in your deal, monthly costs on Three range between £14 - £85 (with £9 - £820 upfront costs).

Useful link: Compare all Three's Galaxy S25 Ultra deals

Vodafone offer 1086x Galaxy S25 Ultra deals starting from £13

From our most recent check, the Samsung Galaxy S25 Ultra is currently available in Titanium Silverblue, Titanium Black, Titanium Grey and Titanium Whitesilver on Vodafone. They have it in three choices of memory: 256GB, 512GB and 1TB.

The Galaxy S25 Ultra comes on two lengths of contract with Vodafone (24 or 36 months) and it's possible to get it either directly with them, or via the re-sellers Fonehouse and Metrofone.

Vodafone's best Samsung Galaxy S25 Ultra deals

✔ Best overall deal

The deal below is Vodafone's current most competitive plan for the Galaxy S25 Ultra:

Unlimited minutes + Unlimited texts +  Unlimited data (4G) =  £39 a month, £145 up front (24‑month contract)
See full deal

🛈 Increased to: £41.50 on April 1 2027.
Increased to: £44.00 on April 1 2028

✔ Unlimited data

For unlimited data with your Samsung Galaxy S25 Ultra, Vodafone's best deal is the same as the one we've chosen as their best overall offer above.

The monthly costs on Vodafone range between £13 - £111.75 according to the amount of minutes, texts and data you want. You're looking at paying £19 - £695 upfront too.

Useful link: Compare all Vodafone's Galaxy S25 Ultra deals