Buying SIM-free is the cheapest long-term way to own a smartphone in the UK in 2026. You pay the handset upfront (or spread the cost with finance), the phone is unlocked to every network from day one, and you're free to pair it with a rolling 30-day SIM-only plan from £4-£15 a month instead of a £40+ contract. Over 24 months, SIM-free plus SIM-only typically saves £150-£400 compared to a network deal on the same handset.
This page compares today's lowest SIM-free prices across Mobiles.co.uk, Fonehouse, Affordable Mobiles, Apple, Samsung, John Lewis, Argos and Amazon, updated daily. We also surface stock on older flagships (iPhone 15, Galaxy S24, Pixel 9), which usually deliver the best pound-for-pound value once the next generation lands.
What does SIM-free actually mean, and is it worth it?
A SIM-free phone is sold without a SIM card, without a network contract and unlocked to every UK and international carrier. You own the handset outright the moment you complete checkout, with no credit check, no minimum term and no early-termination fee. Drop in any 4G or 5G SIM (Vodafone, EE, O2, Three, Smarty, Lebara, iD Mobile and dozens of MVNOs) and you're live.
Total cost of ownership beats a contract more often than not. A typical 256GB iPhone 17 on a 24-month EE contract works out at around £45/month with £49 upfront, or £1,129 over the term. The same handset SIM-free at Mobiles.co.uk is roughly £899, plus a £10/month Smarty 100GB 5G SIM totals £1,139 over 24 months. Line-ball on iPhones, but on Samsung and Pixel the SIM-free route usually wins by £100-£300.
Older flagships are where SIM-free really shines. An iPhone 15 Pro 256GB launched at £1,199 in 2023 and now sells SIM-free for around £649 at Argos and John Lewis. The Galaxy S24 Ultra is down to around £799 from £1,249. Buying last year's flagship typically delivers 90% of the experience for 50-60% of the launch price.
Finance is widely available if you'd rather spread the cost. Klarna and PayPal Pay in 3 split the price across three interest-free instalments at most major retailers. Apple offers 0% finance over 12 or 24 months via PayPal Credit. Samsung Direct runs 0% APR over 24 or 36 months on flagships. Argos Card and Very offer Buy Now Pay Later, but interest applies if you don't clear the balance in the promotional window.
Where to buy. Mobiles.co.uk, Affordable Mobiles and Fonehouse offer the cheapest headline prices on current-gen handsets, with free next-day delivery and 14-day returns. Apple and Samsung Direct charge full RRP but bundle the strongest warranties and trade-in offers. John Lewis adds a free 2-year guarantee, Argos is unbeatable for click-and-collect and Card finance, and Amazon has occasional flash deals (check the seller is Amazon UK).
Warranty matters. Every SIM-free phone comes with a 12-month manufacturer warranty (24 months under the Consumer Rights Act 2015 if the fault is inherent). John Lewis upgrades this to 2 years free. AppleCare+ and Samsung Care+ add accidental damage cover for £8-£12/month and are worth it on £1,000+ handsets.
Travel and dual-SIM benefits. SIM-free phones are unlocked, so you can swap to a local prepaid SIM abroad without roaming charges. iPhones (15 onwards) and most Android flagships also support eSIM, letting you run a UK SIM and a travel eSIM simultaneously via Airalo or Holafly. Contract phones are sometimes locked for the first 12 months, SIM-free phones never are.