Samsung Galaxy S25 Ultra: contract deals across networks

No upfront costs

We've taken each network's Samsung Galaxy S25 Ultra contracts they're offering this April and looked for the ones with no upfront costs. Here are the best choices for small, medium and data allowances we found:

We think this deal from VOXI offers the best value for no upfront cost with a small amount of data:

Unlimited minutes + Unlimited texts +  60GB data (5G) =  £48.10 a month, £0 up front (36‑month contract)
See full deal

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

This is the most-competitive of the largest data plans available with the Galaxy S25 Ultra this month:

Unlimited minutes + Unlimited texts +  250GB data (5G) =  £67.99 a month, £0 up front (36‑month contract)
See full deal

🛈 Increased to: £72.75 on April 1 2027

Or finally, if you'd just rather have unlimited data with your Samsung Galaxy S25 Ultra and nothing to pay up front, we'd say the best option this April is this from Tesco Mobile:

Unlimited minutes + Unlimited texts +  Unlimited data (5G) =  £70.49 a month, £0 up front (36‑month contract)
See full deal

🛈 Increased to: £75.42 on April 1 2027

Useful link: Compare all no upfront cost deals above

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 April:

At the top our list is this £34 a month deal on Three, with an upfront cost of £195:

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 our second choice for unlimited data would be this £44.99 a month plan on iD Mobile:

Unlimited minutes + Unlimited texts +  Unlimited data (5G) =  £44.99 a month, £149 up front (24‑month contract)
See full deal

🛈 Increased to: £46.49 on April 1 2028.
Increased to: £47.99 on April 1 2029

Vodafone's unlimited data Galaxy S25 Ultra plan is next:

Unlimited minutes + Unlimited texts +  Unlimited data (5G) =  £53 a month, £109 up front (24‑month contract)
See full deal

🛈 Increased to: £55.50 on April 1 2027.
Increased to: £58.00 on April 1 2028

After that, the next best is Tesco Mobile's deal here:

Unlimited minutes + Unlimited texts +  Unlimited data (5G) =  £70.49 a month, £0 up front (36‑month contract)
See full deal

🛈 Increased to: £75.42 on April 1 2027

And at the bottom of our unlimited data contract comparison was this £70.67 a month giffgaff effort:

Unlimited minutes + Unlimited texts +  Always On data (5G) =  £70.67 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

And that's it. No other network offers unlimited data with the Samsung Galaxy S25 Ultra. If nothing's tickled your fancy here, use our comparison tool to check other combos of upfront cost, data speed and contract length.

Useful link: Compare all unlimited data deals above

giffgaff: get the Galaxy S25 Ultra from £50.81 a month

Looking at their latest deals in April, if you want the Samsung Galaxy S25 Ultra from giffgaff, they've currently got it in Titanium Black only. And they've only got it in the 1TB memory version.

The Galaxy S25 Ultra comes on two lengths of contract with giffgaff (36 or 24 months) but you can't get it on a contract with them via re-sellers like Carphone Warehouse, you have to join directly.

giffgaff's best Samsung Galaxy S25 Ultra deals

✔ Best overall deal

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

Unlimited minutes + Unlimited texts +  Always On data (5G) =  £93.50 a month, £25 up front (24‑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

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

Price-wise, giffgaff have contracts priced ranging between £50.81 - £103.50 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

iD Mobile's Galaxy S25 Ultra contracts currently start at £29.99 a month

Our latest search of their deals finds that iD Mobile currently have the Samsung Galaxy S25 Ultra in Titanium Silverblue, Titanium Whitesilver, Titanium Jetblack and Titanium Grey. And there's a choice of three memory variants: 256GB, 512GB and 1TB.

iD Mobile sell the Samsung Galaxy S25 Ultra on one contract length: 24 months but you can choose between joining them directly for your deal or via the re-sellers Mobiles.co.uk and Carphone Warehouse.

iD Mobile's best Samsung Galaxy S25 Ultra deals

✔ Best overall deal

This is iD Mobile's current most-competitive plan for the Galaxy S25 Ultra, from our most recent comparison:

Unlimited minutes + Unlimited texts +  Unlimited data (5G) =  £44.99 a month, £149 up front (24‑month contract)
See full deal

🛈 Increased to: £46.49 on April 1 2028.
Increased to: £47.99 on April 1 2029

✔ Unlimited data

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

Their contracts are priced between £29.99 - £64.99 a month, depending on amount of minutes, texts and data in the plan. And you'll pay from £9 - £569 up front too.

Useful link: Compare all iD Mobile's Galaxy S25 Ultra deals

Talkmobile have 140 deals for the Galaxy S25 Ultra

Looking at Talkmobile's current pay monthly contracts for April, they have the Samsung Galaxy S25 Ultra in Titanium Black and Titanium Grey. And they only stock the 256GB version of it.

There's only one choice of contract length for the Galaxy S25 Ultra on Talkmobile: 24 months and the only way you can get it on Talkmobile's network is to join via the re-sellers Metrofone and Fonehouse - they don't offer it directly.

Talkmobile's best Samsung Galaxy S25 Ultra deals

✔ Best overall deal

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

✔ Unlimited data

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

On a pay monthly deal, you're looking at prices between £11.95 - £27.95 per month on Talkmobile, depending on the minutes, texts and data you want. And that's with £295 - £619 upfront costs.

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

Tesco Mobile's Galaxy S25 Ultra deals start from £47.99 a month

From our most recent check, the Samsung Galaxy S25 Ultra is currently available in Titanium Black, Titanium Silverblue and Titanium Whitesilver on Tesco Mobile. They only have it in one choice of memory: 256GB.

You've got five contract length choices of 36, 30, 24, 18 or 12 months for the Galaxy S25 Ultra on Tesco Mobile but it's only possible to get it directly with them - none of the re-sellers like Carphone Warehouse offer Tesco Mobile deals for it.

Tesco Mobile's best Samsung Galaxy S25 Ultra deals

✔ Best overall deal

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

Unlimited minutes + Unlimited texts +  Unlimited data (5G) =  £78.59 a month, £0 up front (30‑month contract)
See full deal

🛈 Increased to: £84.09 on April 1 2027

✔ Unlimited data

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

Depending on the amount of minutes, texts and data you want in your deal, monthly costs on Tesco Mobile range between £47.99 - £151.47 (with £0 - £180 upfront costs).

Useful link: Compare all Tesco Mobile's Galaxy S25 Ultra deals

Three offer 3298x Galaxy S25 Ultra deals starting from £14

On Three, our latest search of all their deals found that the Samsung Galaxy S25 Ultra is available in Titanium Black, Titanium Grey, Titanium Silverblue and Titanium Whitesilver at the moment. Memory-wise, they've got the 256GB, 512GB and 1TB versions.

Three offer the Galaxy S25 Ultra on 24 or 36‑month contracts and you can get it on their network by joining direct or via the Metrofone and Fonehouse re-sellers.

Three's best Samsung Galaxy S25 Ultra deals

✔ Best overall deal

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

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

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

The monthly costs on Three range between £14 - £87.06 according to the amount of minutes, texts and data you want. You're looking at paying £9 - £855 upfront too.

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

Vodafone's Galaxy S25 Ultra deals start at £13 a month

Looking at their latest deals in April, if you want the Samsung Galaxy S25 Ultra from Vodafone, they've currently got it in Titanium Black, Titanium Grey, Titanium Silverblue, Titanium Whitesilver and Titanium Jetblack. And they've got it in the 256GB, 512GB and 1TB memory versions.

The Galaxy S25 Ultra comes on two lengths of contract with Vodafone (24 or 36 months) and you have a choice of getting it on a contract directly from them or via the re-sellers Metrofone, Fonehouse, Carphone Warehouse and Mobiles.co.uk.

Vodafone's best Samsung Galaxy S25 Ultra deals

✔ Best overall deal

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

Unlimited minutes + Unlimited texts +  Unlimited data (4G) =  £40 a month, £135 up front (24‑month contract)
See full deal

🛈 Increased to: £42.50 on April 1 2027.
Increased to: £45.00 on April 1 2028

✔ Unlimited data

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

Price-wise, Vodafone have contracts priced ranging between £13 - £109.92 a month (with £9.99 - £959 upfront), depending on the minutes, texts and data you want.

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

VOXI: get the Galaxy S25 Ultra from £48.10 a month

Our latest search of their deals finds that VOXI currently have the Samsung Galaxy S25 Ultra in Titanium Silverblue and Titanium Black. And there's a choice of two memory variants: 256GB and 512GB.

VOXI sell the Samsung Galaxy S25 Ultra on one contract length: 36 months and you can only get it from them directly, they don't offer contracts via Carphone Warehouse or similar re-sellers.

VOXI's best Samsung Galaxy S25 Ultra deals

✔ Best overall deal

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

Unlimited minutes + Unlimited texts +  60GB data (5G) =  £48.10 a month, £0 up front (36‑month contract)
See full deal

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

✖ Unlimited data

If you want unlimited data with your Samsung Galaxy S25 Ultra, VOXI aren't currently an option, as they don't offer any plans with it.

Their contracts are priced between £48.10 - £51.20 a month, depending on amount of minutes, texts and data in the plan. But there's no upfront costs on any of their plans.

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