Cheapest right now: £41.22/mo on O2 from O2 with £30.00 upfront.
Buy outright from £649.99 (O2)
Samsung Galaxy S25 Ultra
2 retailers · 2 networks · 256GB / 512GB / 1TB
At a glance. The Samsung Galaxy S25 Ultra is currently sold on contract by Mozillion and O2, with airtime from Mozillion and O2. It is available in 3 storage sizes (256GB, 512GB, 1TB); larger sizes add to the price, so pick the smallest you can live with. The cheapest deal by effective monthly cost is £41.22 a month with £30.00 upfront over 36 months on O2, which works out at about £34.05 a month all in. If you would rather buy it outright, the lowest SIM-free price we track is £649.99 from O2 — worth comparing against the contracts above, paired with a SIM-only plan. 104 of the deals are for refurbished handsets, which are usually noticeably cheaper; use the condition filter to compare new and refurbished separately. Key specs: 6.8" dynamic ltpo amoled 2x, a Qualcomm SM8750-AB Snapdragon 8 Elite (3 nm) chip, IP68 water resistance.
The headline trap
The lowest monthly price for this phone is £28.79 — but it comes with £299 to pay upfront.
Cheapest-lookingMozillion
Advertised£28.79/mo
Upfront£299
Whole bill, 24m£989.96
£41.25/mo really
Actually cheapest
Genuinely cheapestMozillion
Monthly£40.04/mo
Upfront£29
Whole bill, 24m£989.96
£41.25/mo really
Choosing the cheapest-looking deal would cost you £0 more over the contract.
Contract or buy outright?
The cheapest new 256GB contract, against buying the same phone outright and adding the cheapest SIM plan with at least 10GB of data, over 24 months.
Assumes the SIM plan price (Mozillion sim only, 10GB, 24-month term) stays the same for the whole period; contracts may also rise each year. Add price rises or cashback in the calculator.
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