Table of Contents

• The Types of Phone Deal Available in the UK
• SIM-Only Deals: The Best Value Category for Most People
• 30-Day vs 12/24-Month SIM-Only Contracts
• The Networks and MVNOs: Who Offers What in July 2026
• When a Handset Contract Actually Makes Sense
• Refurbished Phones: The Underrated Route to the Best Deal
• How to Switch to a Better Deal Without Losing Your Number
• Conclusion
• Frequently Asked Questions (FAQ)
• External References & Further Reading

Most people in the UK are overpaying for their mobile phone. Not by a little — Uswitch's analysis found that switching from an ending 24-month handset contract to a SIM-only plan saves the average consumer £304 per year, or just over £25 per month. That is money going directly to a mobile network for a phone that was fully paid off months ago, continuing to flow without interruption because the household never got around to reviewing the contract. It is one of the most avoidable household costs in Britain.

The UK mobile market in 2026 is exceptionally competitive. The big four networks — EE, O2, Vodafone, and Three — face growing pressure from a wide ecosystem of mobile virtual network operators (MVNOs), smaller providers that use the same underlying infrastructure but charge significantly less because they operate with lower overheads and fewer physical stores. As of July 2026, SIM-only deals are available from as little as £5 per month from budget MVNOs, and even unlimited data plans can be found for £15 to £25 per month from providers like SMARTY and giffgaff. A brand-new flagship contract for the latest iPhone 17 or Samsung Galaxy S26, by comparison, can run to £70 or £80 per month.

This guide cuts through the noise to explain every type of deal available in the UK market right now, which networks and MVNOs offer the best value by use case, exactly when a handset contract makes sense versus when SIM-only is the smarter choice, and the step-by-step process for switching to a better deal without losing your number. Whether you are due an upgrade, paying too much on an old contract, or simply wondering if you could be getting more data for less money — this is where to start.

The Types of Phone Deal Available in the UK

Before comparing specific providers, it is worth establishing exactly what each type of deal is and what it costs, since the terminology is used inconsistently across comparison sites and network marketing:


Biggest single saving available in the UK mobile market: ~£304/year by switching from handset contract to SIM-only — calculated by Uswitch based on the top-selling 24-month handset contract (iPhone 15, Unlimited data) vs the cheapest equivalent SIM-only deal (iD Mobile, £15/month, 24-month) — a saving that many consumers leave on the table simply by not reviewing their contract at renewal (Uswitch, January 2026)

The rule that changed the whole market: In December 2021, Ofcom banned UK mobile networks from selling locked handsets — phones tied to a single network that cannot be used with another provider's SIM card. All phones sold in the UK after that date must be sold unlocked, which means that if you bought your phone after December 2021, you can take your handset to any UK network's SIM card with no unlocking fee and no technical barriers. This single regulatory change made SIM-only switching dramatically more accessible, and is a key reason why the SIM-only market has grown so substantially since 2022.

SIM-Only Deals: The Best Value Category for Most People

SIM-only deals are consistently identified by independent consumer organisations including Which?, MoneySavingExpert, and Uswitch as the best-value category for the majority of UK mobile users — specifically those who own a working phone, are happy with it, and simply need data, calls, and texts. There is no phone subsidy baked into the monthly cost, which means the monthly price is often dramatically lower than an equivalent handset contract and data allowances are frequently more generous.

The SIM-only market divides cleanly into two segments: the four major networks (EE, O2, Vodafone, Three), which offer premium coverage, customer service infrastructure, and branded extras; and the MVNO ecosystem, which uses exactly the same network infrastructure but strips out the overhead of high-street shops and extensive marketing to deliver lower prices for the same underlying service.

30-Day vs 12/24-Month SIM-Only Contracts

SIM-only deals come in three lengths: rolling 30-day plans, which can be cancelled at any time with 30 days' notice and are ideal for those who want maximum flexibility or expect to switch frequently for the best deal; 12-month contracts, which lock in a specific price for a year and typically offer better rates than 30-day plans at the cost of some flexibility; and 24-month contracts, which offer the lowest monthly prices but the longest commitment. For most people who are not worried about needing to move quickly, a 12-month SIM-only deal offers the best balance of price certainty and reasonable commitment.

The Networks and MVNOs: Who Offers What in July 2026

The table below summarises the key characteristics of the main UK networks and the most popular MVNOs as of July 2026, focusing on what makes each one worth considering rather than specific price-per-month figures that will have changed by the time you read this:



A few patterns stand out from this comparison. First, MVNOs consistently undercut the big four for SIM-only pricing, often by a significant margin — giffgaff's plans start at £5 per month, Tesco Mobile from £8, and SMARTY from approximately £10, all on the same underlying infrastructure as O2 (giffgaff, Sky Mobile, Tesco Mobile) or Three (SMARTY). The trade-off is typically less premium customer service, online-only account management, and occasionally slower customer support response times. Second, EE consistently delivers the UK's most extensive 4G and 5G coverage and fastest average speeds, making it the best choice for reliable connectivity in rural or less densely covered areas — but you pay a premium for that reach. Third, O2 is currently the only major UK network including EU roaming on all plans, which is a genuine differentiator for anyone who travels frequently within Europe.

The MVNO question most people don't ask: An MVNO's coverage is identical to the network it runs on, because it is literally using the same masts, frequencies, and infrastructure. A giffgaff SIM in Surrey has exactly the same signal as an O2 SIM in Surrey. The difference is not coverage — it is customer service model, extras, and price. If the MVNO's network partner has good coverage in the areas where you spend the most time, the MVNO will have the same coverage at a lower price. Always check your network partner's coverage map specifically, not the MVNO's own map, for the most accurate picture.

When a Handset Contract Actually Makes Sense

SIM-only deals dominate the value conversation, but there are specific circumstances where a handset contract makes genuine financial sense and is worth considering:

• When the upfront cost of the phone is genuinely unaffordable: A Samsung Galaxy S26 or iPhone 17 Pro may cost £999 to £1,299 to buy outright. For households that cannot comfortably absorb that upfront cost, a handset contract spreads the device cost across 24 months. The total cost is typically higher than buying the phone outright and pairing it with SIM-only, but the monthly cashflow impact is more manageable.
• When the contract includes insurance or manufacturer warranty extensions: Some handset contracts bundle device insurance that would cost £10 to £15 per month separately. If you are genuinely likely to claim on it — based on your track record with phone damage or loss — the bundled insurance can tip the maths toward a contract.
• When the effective per-unit cost of the phone works out reasonable: The best check is to price the phone SIM-free, find the cheapest equivalent SIM-only deal, and compare the combined monthly cost to the handset contract. If the handset contract is pricing the phone at below market value for the device, it may be worth it. If it is pricing it above market — which is common — it is not.

Which?'s July 2026 guide confirms that the Samsung Galaxy S26 has traded at an average price of £1,113 over the past six months with a lowest recorded price of £799, while the market for previous-generation devices like the S25 has fallen significantly. This means that for buyers willing to consider one or two generations back, the SIM-free-plus-SIM-only route becomes even more compelling in value terms.

Refurbished Phones: The Underrated Route to the Best Deal

One of the most consistently underused routes to a genuinely excellent phone deal in the UK is the refurbished market. MoneySuperMarket's expert commentary specifically highlighted in July 2026: 'The smartest way to cut your mobile costs is to separate the phone from the tariff — pairing a quality refurbished handset with a SIM-only plan can save hundreds of pounds over a two-year contract.'

A refurbished phone is a used device that has been professionally inspected, cleaned, and returned to working condition, then resold — usually with a 12-month warranty, sometimes longer. Grade A refurbished devices typically show minimal or no signs of use and are functionally equivalent to new. An iPhone 15 Pro in Grade A condition from a reputable UK refurbisher costs significantly less than a new iPhone 17, yet runs the same iOS version, takes excellent photos, and supports all the same apps.

The combination of a Grade A refurbished handset — bought outright or on a short-term payment plan — plus a monthly-rolling SIM-only deal from an MVNO represents the lowest total cost of ownership of any phone setup for most UK consumers. The only upfront barrier is the lump-sum purchase of the device, which can be partially offset by trading in or selling your current handset.

Refurbished phone trade-in value: Up to £250+ for an iPhone 17 Pro Max in excellent condition — trade-in programmes from networks and third-party services like Reboxed and Uswitch's refurbished marketplace provide an immediate offset against the cost of a refurbished or new device, reducing the effective upfront cost of switching to the SIM-only + device ownership model (Uswitch / Reboxed, February 2026)

How to Switch to a Better Deal Without Losing Your Number

Switching to a new network or SIM-only deal is easier than most people assume, and the process of keeping your existing number is straightforward:

1. Check whether you are still in contract: Text INFO to 85075 for free to get your current contract status, end date, and any early exit fees from your current provider. If you are still in contract, compare the cost of the exit fee against the savings from switching — in some cases, even paying a modest exit fee is worth it if the new deal saves more over 12 months.
2. Get a PAC code to keep your number: Text PAC to 65075 from your mobile to receive your Porting Authorisation Code immediately. This code is valid for 30 days. Give it to your new provider when signing up and they will handle the transfer — your old contract cancels automatically when the switch completes, typically within one working day. You do not need to contact your old provider to cancel separately.
3. Compare deals for your specific postcode and usage: Use Uswitch, MoneySuperMarket, Compare the Market, or MoneySavingExpert's comparison tools, entering your actual usage (data per month, calls per month) and postcode to ensure the deals shown are available in your area. Check whether 5G is available from the network you are considering using your address specifically — 5G now covers 64-89% of the UK depending on the network.
4. Check for mid-contract price rise terms: Some phone contracts include annual mid-contract price rises, typically linked to CPI or RPI inflation plus an additional percentage. Compare the Market and Uswitch both now flag which deals include these clauses. A deal that looks cheap today but rises by CPI + 3.9% annually for 24 months may cost significantly more than advertised over its full term.
5. Consider the timing: The best deal at the moment of switching may not be the single best deal available if you can wait a few weeks. Comparison sites run promotions, networks offer seasonal deals, and cashback via sites like TopCashback or Quidco can add a one-off further reduction. For a 24-month commitment, taking a few extra days to compare is always worthwhile.

Conclusion

The UK phone deal market in July 2026 offers more genuine consumer choice — and more scope for genuine savings — than at any point in the past decade. The combination of regulatory change (unlocked handsets from 2021), a maturing MVNO ecosystem, competitive SIM-only pricing, and the growing refurbished device market has created a landscape where the penalty for staying on an old, post-contract handset deal is both avoidable and measurable: approximately £304 per year, according to Uswitch's analysis.

The core principles for getting the best phone deal in 2026 are consistent regardless of budget: separate the cost of the phone from the cost of the tariff where possible; choose the network or MVNO whose coverage suits your specific locations rather than defaulting to a brand name; compare on actual unit rates (price per GB, price per call minute) rather than headline monthly cost alone; and review your deal at every contract end date rather than letting it roll over unchecked. The mobile market rewards active consumers and disadvantages passive ones — the savings available to those who look are real, immediate, and require nothing more than a comparison site and a PAC code.

Frequently Asked Questions (FAQ)

What is the cheapest phone deal in the UK right now?

The cheapest SIM-only deals in the UK as of July 2026 start from approximately £5 per month from budget MVNOs including giffgaff and SMARTY, typically offering limited data allowances suitable for light users. Unlimited data SIM-only deals are available from approximately £15 to £25 per month from MVNOs including SMARTY and iD Mobile. These prices change frequently with promotional offers, so using a comparison site at the time of purchase is the most reliable way to find the current cheapest option for your specific usage and postcode.

Is SIM-only always cheaper than a phone contract?

In terms of monthly cost, yes — but the comparison needs to account for the cost of the handset. If you need a new phone, a SIM-only deal does not include one, so the total cost depends on how you acquire the device. The most reliable comparison is: find the SIM-free purchase price of the phone you want, add the monthly cost of the cheapest suitable SIM-only deal over 24 months, and compare that total against the 24-month handset contract. In most cases, SIM-free plus SIM-only still wins on total cost, but the advantage over a handset contract narrows when the contract is competitively priced.

Can I keep my number if I switch to a new network?

Yes. Text PAC to 65075 from your current mobile to receive your Porting Authorisation Code, then provide this code to your new network when signing up. The transfer typically completes within one working day, during which you will experience a brief period of no mobile service. Your old contract cancels automatically when the switch completes — you do not need to separately cancel with your old provider. Your PAC code is valid for 30 days from the date of issue.

What is an MVNO and are they safe to use?

A Mobile Virtual Network Operator (MVNO) is a company that provides mobile services using the infrastructure of one of the four major UK networks — EE, O2, Vodafone, or Three — without owning its own network. Popular UK MVNOs include giffgaff (uses O2), SMARTY (uses Three), Sky Mobile (uses O2), Tesco Mobile (uses O2), and Asda Mobile (uses Vodafone). They are entirely legitimate, regulated by Ofcom, and provide exactly the same coverage as their network partner. Customer service is typically online-based rather than through physical stores, which is how they achieve lower prices. Consumer organisations including Which? consistently rate several MVNOs highly for customer satisfaction.

What should I watch out for when comparing phone deals?

The most important things to check beyond the headline monthly price are: mid-contract price rises — some contracts include annual increases of CPI or RPI plus an additional percentage, which can add significantly to the total cost over 24 months; exit fees — check the amount and whether the contract allows early termination; 5G availability — confirm your address is within the network's 5G coverage area if 5G is a priority; data speed caps — some budget MVNOs cap data speeds on cheaper plans; and roaming terms — check whether EU data roaming is included if you travel to Europe frequently. Compare the Market and Uswitch both flag mid-contract price rise clauses in their comparison results, making them useful tools for identifying the true cost of longer contracts.

External References

The following authoritative sources were used in researching this article and are recommended for further reading:

1. Which? — Best Mobile Phone and SIM-Only Deals: July 2026
https://www.which.co.uk/reviews/mobile-phones/article/best-mobile-phone-and-sim-only-deals-aj8Ql8r9drKy
2. Uswitch — Mobile Phone Deals and Contracts: July 2026
https://www.uswitch.com/mobiles/
3. Uswitch — Compare SIM-Only Deals: July 2026
https://www.uswitch.com/mobiles/compare/sim_only_deals/
4. MoneySuperMarket — SIM-Only Deals: July 2026
https://www.moneysupermarket.com/mobile-phones/sim-only/
5. MoneySuperMarket — Mobile Phone Deals: July 2026
https://www.moneysupermarket.com/mobile-phones/
6. Compare the Market — SIM-Only Deals: June/July 2026
https://www.comparethemarket.com/mobile-phones/sim-only/
7. TechRadar — Best SIM-Only Deals: July 2026
https://www.techradar.com/sim-only/sim-only-deals
8. Ofcom — Ofcom Mobile Network Rules: Handset Unlocking (December 2021)
https://www.ofcom.org.uk/phones-and-broadband/tips-for-comparing-mobile-services