Mid-Contract Mobile Price Rises UK 2026: Your Rights and How to Exit

Ofcom’s new mid-contract price-rise rules came into force on 17 January 2025, ending more than a decade of inflation-linked CPI+3.9% hikes for new UK mobile and broadband contracts. From that date, any rise must be set out in pounds and pence — not as a formula — at the moment you sign. April 2026 was the last round of inflation-linked rises for legacy customers; from 2027, every UK mobile and broadband customer will be on a £/pence regime.

The headline change has not stopped bills going up. Most operators set their 2026 increases between £1.50 and £4 a month, and the move from percentage to flat pounds means low-data SIM-only customers can pay more than they did under the old CPI formula. Citizens Advice polling in late 2025 found 24% of UK broadband users described a £4 mid-contract rise as “unmanageable”. This guide explains the new rules, what each major provider is raising in 2026, when you can actually exit penalty-free, and the legitimate moves to cut your bill without breaking your contract.

What changed on 17 January 2025

Before 2025, the standard UK mobile and broadband contract included a clause allowing the provider to raise your monthly price each April by December’s CPI plus a 3.9% provider markup. The 2024 rise was 7.9%; the 2025 rise was also 7.9%. Customers had no penalty-free exit because the formula had been disclosed at sale and Ofcom regarded the wording as “sufficiently prominent”.

Ofcom changed its mind. From 17 January 2025, contracts signed or renewed on or after that date cannot contain inflation-linked rises. Any in-contract increase must be expressed in pounds and pence, with the exact amount, timing and what’s affected stated upfront. Customers who signed earlier remain on their old terms until they re-contract, but every major operator has committed that April 2026 is the final inflation-linked round.

2026 price rises by provider

The O2 line in that table is the one Ofcom has publicly attacked. After advertising £1.80 to customers joining from January 2025, O2 announced in October 2025 that anyone joining on or after 23 October would face a £2.50 rise in April 2026. Ofcom said O2’s move was “against the spirit of our rules”, the technology secretary called it “disappointing”, and Martin Lewis said it “makes a mockery” of the new regime. No formal fine has landed, but the watchdog has been instructed to “go further, faster”.

Worked example: £25/month mobile contract

For a £15/month SIM-only deal, the £1.80 flat rise works out at 12% in year one — proportionally worse than the old CPI+3.9% formula. The new rules deliver more transparency, not necessarily a smaller bill.

When you can exit penalty-free

This is the question Ofcom’s complaints inbox is full of. The short answer is: most April 2026 rises do not give you an exit right, because they were either pre-disclosed in £/p (new contracts) or pre-disclosed in CPI+3.9% (legacy contracts). But there are real exceptions:

• Provider gives less than 30 days’ notice. If the notice is short, the change is unilateral and you can leave penalty-free under the General Conditions.
• The rise is bigger than what your contract specified. The most prominent live example is O2’s £1.80 → £2.50 move, where customers who joined under the £1.80 promise may have grounds — Ofcom is investigating.
• Provider materially changes service or terms. A loss of features, a downgrade in speed, or any contractual change beyond price triggers a 30-day window to leave.
• You are out of contract. Always free to leave with no exit fee.

Old CPI+3.9% rises do not, on their own, give exit rights — Ofcom’s pre-2025 view was that the formula was sufficiently disclosed. New £/p rises do not either, for the same reason. The framing of the original Ofcom announcement was “transparency at sale”, not “easier exit later”.

If you can’t exit, what you can do

1. Get to the end of your minimum term, then switch. Out-of-contract customers were quietly the biggest losers of the old regime — providers happily applied annual rises year after year. As of 1 March 2026 EE/BT moved all out-of-contract customers onto the new £/pence rises, but switching to a sub-£15 SIM-only deal still beats staying. Most contract customers can leave 30 days before the minimum-term end date without penalty.
2. Use Text-to-Switch. Send PAC to 65075 from your mobile and you’ll receive a porting code within a minute. The switch completes within one working day. Send STAC for the same number if you want to leave but not port the number.
3. Use One Touch Switch for broadband. Live since 12 September 2024. You contact only your new provider; they handle the cancellation with your old one. There is no double-billing window.
4. Haggle. Citizens Advice’s 2025 polling found 78% of UK customers experience at least one painful step renegotiating, but those who push through frequently get retention offers — a £5 to £10/month reduction is common. If you have a competing quote ready, ask the retention team to match it.
5. Check social tariffs. If you’re on Universal Credit, Pension Credit, JSA, ESA, Income Support or some PIP-linked benefits, providers must offer a social tariff. The cheapest 2026 options: Vodafone Essentials broadband £12/month (38 Mbps), BT Home Essentials £15/£20, SMARTY social tariff £12/month unlimited mobile, VOXI For Now £10/month unlimited. Ofcom estimates 532,000 households now use one — up from 1.2% take-up two years ago.

How to complain — and the new 6-week ADR deadline

1. Phone the provider and ask them to log a formal complaint, not just a query. Make a note of the reference number, the date, and what was agreed.
2. If unresolved after 8 weeks, or you receive a “deadlock” letter, escalate free of charge to one of Ofcom’s two approved Alternative Dispute Resolution (ADR) schemes: CISAS (run by CEDR) or the Communications Ombudsman. Every UK telecoms provider must be a member of one.
3. From 8 April 2026 the wait drops to 6 weeks for complaints raised on or after that date — Ofcom’s response to a year of rising volume.
4. ADR rulings can include refunds, bill credits, contract release and apologies. They cost you nothing; providers pay the case fee.

Who’s the worst offender right now?

Ofcom’s Q3 2025 complaints data (published February 2026) recorded the first rise in telecoms complaints since 2023, driven specifically by customers reacting to mid-contract price-rise notices. Vodafone and TalkTalk topped the broadband league table, at 11 and 10 complaints per 100,000 customers respectively. O2 led on mobile, in large part because of its £1.80-to-£2.50 reversal. Sky and BT/EE attracted fewer complaints per customer despite very similar £3–£4 broadband rises — suggesting clearer communication is half the battle.

Frequently asked questions

Can I leave my contract if my provider raises the price mid-term?

Generally no, because the rise was disclosed in your original contract — either as a £/pence amount (post-17 January 2025) or as CPI+3.9% (older contracts). You can leave penalty-free only if the provider gives less than 30 days’ notice, imposes a rise larger than the one in your contract, or materially changes the service.

What is the maximum my mobile bill can go up in April 2026?

For new £/p contracts, the rise is set in advance — typically £1.50 to £2.50/month on a SIM-only plan, up to £4/month on handset contracts. For legacy CPI-linked contracts, the 2026 rise is around 7.3% (CPI 3.4% + 3.9%); RPI-linked Virgin Media O2 contracts rose 7.7%.

Is O2’s £2.50 rise legal?

Ofcom said the move was “against the spirit of our rules” but has not yet found it unlawful. Customers who joined O2 between 17 January 2025 and 22 October 2025 — when the rise was advertised as £1.80 — may have stronger grounds. If you’re affected, raise a formal complaint and escalate to CISAS or the Communications Ombudsman after the 6 or 8-week deadlock period.

How do I switch mobile network without losing my number?

Text PAC to 65075 from the number you want to keep. You’ll receive a porting code within a minute. Give that code to your new provider when you sign up and they’ll switch you within one working day, retaining the number.

Do social tariffs really exist for mobile and broadband?

Yes — and uptake has tripled in two years. As of early 2026 around 532,000 UK households use one. The cheapest broadband social tariff is Vodafone Essentials at £12/month for 38 Mbps; the cheapest mobile is SMARTY’s £12/month unlimited deal. To qualify you typically need to be on Universal Credit, Pension Credit, JSA, ESA, Income Support or specific PIP-linked benefits.

When can I take a complaint to ADR?

After receiving a deadlock letter, or after 8 weeks of unresolved correspondence. From 8 April 2026 the wait drops to 6 weeks for new complaints. ADR is free for consumers — providers pay the case fee.

Related guides on GetSmartSaver.Uk

• Best SIM-Only Deals UK 2026: Cut Your Mobile Phone Bill
• Social Tariff Broadband UK 2026
• Best Broadband Deals UK 2026: Provider Comparison
• 5G Home Broadband UK 2026
• Full Fibre Broadband UK 2026

Last updated 30 May 2026. Figures verified against Ofcom statements, provider price-change pages (EE, Vodafone, Three, O2, Sky, TalkTalk, Virgin Media), Uswitch, Money Saving Expert and Citizens Advice. This article is general guidance, not legal advice.