Samsung · contract deals
Galaxy S25 Ultra deals
We compared 66 Galaxy S25 Ultra contracts across 3 networks and ranked them by what you really pay over 24 months — upfront, every monthly payment and each April rise.
bemobiles tips
Is the lowest monthly price the best deal?
In this case the lowest monthly deal is also the cheapest overall, but always check the upfront cost and the 24-month total.
What will April price rises add?
On the cheapest iD Mobile deal, about £43.20 over 24 months for a contract started this month. The table below adds the rise for every network.
Should I buy it outright instead?
Not today. SIM-free plus a cheap SIM costs £467.04 more over two years than the cheapest contract.
- £19 upfront
- then £35.99 a month
- 100GB data · 24 months
- April rises: about +£43.20
24-month total £925.96
Get this dealiD Mobile review →The Galaxy S25 Ultra deal with the lowest total cost over 24 months, April rises included — live.
The cheapest Galaxy S25 Ultra contract today is on iD Mobile at £925.96 over 24 months (£19 upfront, £35.99 a month), or about £925.96 once April rises are added. The best deal on O2 costs £633.04 more over the same period. Buying SIM-free and adding a 30-day SIM costs £1,393.
Prices checked 28 October 2026 · rises estimated for a contract starting this month · How we compare
Galaxy S25 Ultra on every network
The cheapest 24-month deal on each network, sorted by the true total — the headline total plus the April rises the network has announced.
| Network | Monthly | Upfront | 24-month total | April rises (est.) | True total | |
|---|---|---|---|---|---|---|
| £35.99 | £19 | £925.96 | +£43.20 | £925.96 | View |
 | £52 | £199 | £1,507 | +£60 | £1,507 | View |
 | £60 | £59 | £1,559 | +£60 | £1,559 | View |
Rises use each network’s announced amount in pounds (Tesco Mobile about 6%). Sky Mobile’s rise isn’t fixed in the contract, so it isn’t included.
Contract or buy outright?
The contract is cheaper by £467.04
Cheapest contract
£925.96
- iD Mobile, 24 months
- £19 + 24 × £35.99
- April rises: +£43.20
SIM-free + SIM only
£1,393
- Phone from £1,249 (256GB)
- SMARTY 18GB at £6 × 24
- No price rise, leave any month
Outright prices from retailers via our data partner. You keep the phone either way.
Our take on the Galaxy S25 Ultra
The cheapest way to get the Galaxy S25 Ultra on contract today is on iD Mobile: £19 upfront and £35.99 a month with 100GB of data, £925.96 over 24 months. At the other end of our table, O2’s best deal works out £633.04 dearer once rises are counted — the same phone, so the network choice alone is worth that much.
iD Mobile adds £1.80 a month every April, so a contract started now costs about £43.20 more than the headline figure: £925.96 in all. Networks without an annual rise are worth a look if the gap is small.
Buying the Galaxy S25 Ultra SIM-free costs from £1,249. Pair it with a SMARTY 30-day SIM at £6 a month and two years cost £1,393, £467.04 more than the cheapest contract. Here retailers discount the handset to win the airtime, so the contract wins on price.
The Galaxy S25 Ultra has a 6.9-inch screen, a 5,000 mAh battery, a weight of 218 g. It is on sale with 256GB, 512GB of storage in 4 colours. It was released in January 2025.
Pick it if…
- You want it for £35.99 a month on iD Mobile
- You want a choice of storage, up to 512GB
- You want to pay little upfront — from £0 on iD Mobile
Skip it if…
- Your current phone still works — SIM only from £6 a month is far cheaper
Galaxy S25 Ultra key specs
| Screen | 6.9 inches |
|---|---|
| Battery | 5,000 mAh |
| Storage | 256GB, 512GB |
| Weight | 218 g |
| Size | 163 × 78 × 8 mm |
| Colours | White, Blue, Black, Grey |
| Released | January 2025 |
Specifications from our data partner’s catalogue.
All Galaxy S25 Ultra deals, live
FAQ
Galaxy S25 Ultra questions
How much is the Galaxy S25 Ultra on contract?
The lowest total cost we found today is £925.96 over 24 months on iD Mobile: £19 upfront and £35.99 a month, plus about £43.20 in April price rises.
What is the cheapest monthly price for the Galaxy S25 Ultra?
£35.99 a month on iD Mobile, with £19 to pay upfront. A low monthly price usually means a bigger upfront payment, so compare the 24-month total.
Is it cheaper to buy the Galaxy S25 Ultra outright?
Buying it SIM-free from £1,249 and adding a SMARTY SIM at £6 a month costs £1,393 over two years — £467.04 more than the cheapest contract including price rises.
What storage and colours does the Galaxy S25 Ultra come in?
Storage: 256GB, 512GB. Colours on sale now: White, Blue, Black, Grey.