Most UK mobile networks increase your monthly bill once a year, part way through your contract. The amount varies considerably between providers, and a few do not increase prices at all.
This guide explains how mid-contract price rises work, what each major network currently charges, how much an increase actually costs across a full contract term, and when you can leave without paying a penalty.
If you are shopping now, you can compare pay monthly deals across every network we list.
Reviewed by Phil Brown, founder of Mobile Phone Finder. Phil has worked in the UK mobile industry, including retail management at Three UK, and has spent over a decade building consumer technology comparison platforms. About the author
What a mid-contract price rise is
A mid-contract price rise is an increase to your monthly bill that happens while you are still inside your minimum contract term. It is not a penalty or an error. It is written into the contract you signed.
Almost all UK networks apply these increases in April. The increase usually applies to the airtime element of your plan, meaning your calls, texts and data, rather than to the cost of the handset itself. On contracts where the handset is a separate credit agreement, that part of your bill generally stays fixed.
The important consequence is that the monthly price you compare at the point of sale is not the monthly price you pay for most of the contract. On a 24 month deal you will normally see one increase. On a 36 month deal you will usually see two, and on a 48 month deal three.
The rules changed in 2025
Until recently, most networks linked their annual increase to inflation, typically the Consumer Price Index plus an additional percentage. That meant nobody, including the network, knew what the increase would be at the point of sale.
Ofcom banned that approach for new contracts. From January 2025, providers must state any in-contract price increase in pounds and pence before you sign, so the exact amount is known in advance. The Advertising Standards Authority separately requires that information about in-contract rises is given equal prominence to the headline monthly price in advertising.
Two things follow from this. New contracts should now carry a fixed, stated increase rather than an inflation-linked one. And older contracts signed before the change may still be on the previous inflation-linked terms, which is why two customers on the same network can face very different increases in the same year.
A stated future increase is an expectation rather than an absolute guarantee, which the following section explains.
What each network charges
The position below reflects each provider's published terms at the time of our most recent review. Networks change these terms, so confirm the figure for the specific deal before signing.
Networks with a fixed annual increase
O2 applies a fixed increase to the airtime element each April, set at £2.50 a month for voice plans and 75p a month for data-only and smartwatch plans. The device element of the bill is not increased.
Vodafone states that the monthly cost increases each year on 1 April by £2.50 for pay monthly plans with airtime and data. Its cheaper SIM Only Basics plans rise by £1.50 instead. As with O2, the increase does not affect device plans, so the handset element of the bill stays fixed.
Three tiers its increase by data allowance rather than applying a single figure. From 1 April 2026 the amounts are £1.80 a month for plans with 4GB and below, £1.90 for plans between 5GB and 99GB, and £2.30 for plans of 100GB and above.
iD Mobile applies an increase to handset contracts, currently £1.80 each April on 24 month phone plans. Its SIM-only plans carry a no annual price rise commitment, which is covered below.
Networks where it depends on the deal
Tesco Mobile splits its position. On Clubcard Prices deals it freezes the basic monthly usage price for the length of the minimum contract period, with an annual April increase applying only once that term has ended. On non-Clubcard deals an annual April increase applies, shown in pounds and pence at the point of sale for contracts taken from 17 December 2024 onwards. A Clubcard is free to obtain, so this is a difference worth acting on.
giffgaff guarantees no mid-contract price rises on its 18 month plans as a contractual commitment, subject to the sign-up window applying to the specific deal. Rolling monthly plans carry no guarantee, but they can be cancelled at any time.
Networks that do not raise prices mid-contract
Talkmobile no longer applies annual price rises. It removed the increase clause from its terms and conditions in December 2024 and states that its plans carry no annual rises and no CPI or RPI linked increases. This is a stronger position than a promotional pledge, because it rests on the absence of a contractual right rather than a decision not to use one.
Mozillion states that its pricing is fixed for the contract term with no mid-contract price rises.
Social tariffs are exempt across the market. Vodafone confirms that customers on its Essentials tariff and on VOXI For Now are not subject to annual price increases. Other providers take a similar approach, so if you qualify for a social tariff it is worth asking whether the exemption applies.
Voxi sells airtime on rolling monthly terms rather than fixed minimum terms, so an annual increase does not apply to the airtime element in the same way. The handset is a separate fixed-term repayment agreement.
Older contracts and the CPI plus 3.9 per cent formula
If you signed or last upgraded before your network moved to pounds and pence pricing, you may still be on the previous inflation-linked formula. That formula was typically the Consumer Price Index figure published in January, plus an additional 3.9 percentage points.
For 2026 that produced an increase of 7.3 per cent, based on a January CPI figure of 3.4 per cent. On a £40 monthly plan, that is roughly £2.92 a month, or £35 across a year.
Networks with customers still on these terms include Vodafone, Three and Tesco Mobile, depending on when the contract was taken. If you are unsure which applies to you, your contract terms or your network account should say.
Stated increases are not always guaranteed
The move to pounds and pence pricing was intended to give certainty. One episode in 2026 shows the limits of that.
O2 raised its April 2026 airtime increase to £2.50, above the £1.80 that had previously been written into customer contracts. Ofcom publicly stated that it was disappointed by the decision and that the move went against the spirit of rules requiring providers to set out increases in pounds and pence before customers sign up. Affected customers were given the right to exit without an early termination charge, although any outstanding handset balance still had to be paid.
The practical lesson is that a stated future increase sets an expectation rather than an absolute ceiling. That matters most on longer contracts, where more increases fall inside the term and there is more time for terms to change.
What an annual increase actually costs you
The monthly figure looks small. Across a full contract it is not, and it is frequently larger than the gap between two deals that look close at the point of sale.
Take a £2.50 monthly increase. On a 24 month contract, one increase applies for roughly the second year, adding about £30 to the total. On a 36 month contract, two increases apply, adding roughly £90. On a 48 month contract, three increases apply and the total added is roughly £180.
Those figures are approximate, because the exact amount depends on where your contract start date sits relative to April. A contract starting in May sees its first increase almost a year later, where one starting in March sees an increase within weeks.
Two conclusions follow. First, compare the total amount payable across the full term rather than the monthly price, and add the stated increases into that total. Second, a longer contract carries more exposure, which partly offsets the lower monthly figure that made it look attractive.
On networks that tier the increase by data allowance, as Three does, a larger allowance means both a higher starting price and a larger annual increase. Our guide to what is a good data allowance covers how to judge the size you actually need.
Can you leave if your price goes up?
Usually not, if the increase is the one you were told about at the point of sale. An increase set out in your contract terms before you signed is part of the agreement, so it does not normally give you a right to exit without charge.
The position is different where a provider changes terms to your detriment in a way you were not told about in advance. In that situation you generally have the right to leave without an early termination charge, and the provider must tell you about that right. The O2 case in 2026 is the clearest recent example, where customers were given a penalty-free exit window because the increase exceeded the amount stated in their contracts.
An outstanding handset balance is treated separately. Even where you can exit the airtime agreement without penalty, the money owed on the phone still has to be paid.
If you do decide to leave, our guide on how to keep your number when switching explains the PAC code process, and how to check your exit cost first without committing to anything.
How to avoid mid-contract price rises
Several approaches genuinely work, and they suit different people.
- Choose a provider that does not apply them. Talkmobile has removed the clause from its terms, Mozillion states that its pricing is fixed, and giffgaff guarantees against rises on its 18 month plans.
- Take a qualifying deal on a network that freezes selected tariffs. Tesco Mobile's Clubcard Prices deals are frozen for the minimum term, and a Clubcard is free.
- Choose a shorter contract. Fewer Aprils inside the term means fewer increases. A 12 month deal may see one, where a 48 month deal sees three.
- Buy the handset separately. Pairing a SIM-free handset with a rolling plan means you are never locked into an increase, though you pay more upfront.
- Check the deal type, not just the network. Several providers apply increases to some plans and not others, so the network name alone does not tell you the answer.
Frequently asked questions
Which UK networks do not raise prices mid-contract?
Talkmobile removed the annual increase clause from its terms in December 2024 and states its plans carry no annual price rises. Mozillion states its pay monthly pricing is fixed for the contract term. giffgaff guarantees against rises on its 18 month plans, subject to the sign-up window. Tesco Mobile freezes the price on Clubcard Prices deals for the minimum term, and iD Mobile commits to no rises on SIM-only plans, though not on handset contracts.
When do mobile price rises happen?
Almost all UK networks apply their annual increase in April. Increases are usually announced between December and February, so a customer signing a contract early in the year should check whether an increase is due within weeks of starting.
How much will my bill go up in April?
It depends on your provider and when you signed. Under current terms, O2 and Vodafone apply around £2.50 a month to most contract plans, and Three applies between £1.80 and £2.30 depending on your data allowance. Customers still on older inflation-linked contracts faced 7.3 per cent for 2026, based on January CPI of 3.4 per cent plus 3.9 percentage points.
Can I cancel my contract because of a price rise?
Not usually, if the increase was set out in your contract terms before you signed. If a provider changes terms to your detriment in a way you were not told about in advance, you generally have the right to leave without an early termination charge, and the provider must tell you about that right. Any outstanding handset balance still has to be paid.
Does the price rise apply to my handset payments too?
Usually not. On contracts that separate the airtime plan from the device agreement, the increase normally applies to the airtime element only and the handset cost stays fixed. On combined contracts, check the terms, as the position varies by provider.
Why do two people on the same network get different increases?
Because the terms depend on when the contract was taken. Ofcom required providers to state increases in pounds and pence for new contracts from January 2025. Customers who signed before their provider made that change may still be on the older inflation-linked formula, which produces a different figure.
Does a bigger data allowance mean a bigger price rise?
On some networks, yes. Three tiers its annual increase by data allowance, so plans of 100GB and above attract a larger monthly increase than smaller plans. Across a long contract that widens the gap between tiers beyond what the headline monthly prices suggest.
Summary
Most UK networks increase the airtime element of your bill each April, with the amount now stated in pounds and pence at the point of sale for new contracts rather than linked to inflation. O2 and Vodafone apply around £2.50 a month, and Three applies between £1.80 and £2.30 depending on data allowance. Talkmobile, Mozillion and giffgaff avoid increases in different ways, and Tesco Mobile freezes the price on Clubcard Prices deals. Across a 36 month contract a £2.50 increase adds roughly £90 to the total, which is often more than the difference between two deals that look similar on monthly price. Compare on total cost, and add the stated increase before deciding.
How we put this guide together
Network price rise positions are taken from each provider's own published terms rather than from third party summaries, because several widely cited sources still describe policies that networks have since changed. Where a position differs between deal types on the same network, we have said so rather than giving a single figure for the brand.
The regulatory position is taken from Ofcom's published rules and statements. We do not model individual bills, and the cost examples here are illustrative calculations based on stated increases rather than quotes for a specific tariff.
Sources and methodology
- Published pricing and charges terms for each network covered, for the annual increase amounts, the deal types each applies to, and the dates from which pounds and pence pricing took effect, including Vodafone's published annual price change terms and O2's published prices page
- Ofcom rules on in-contract price rises, effective January 2025, for the requirement to state increases in pounds and pence before sign-up
- Ofcom statement on O2 price rises, for the 2026 increase above the contracted amount, the regulator's response, and the penalty-free exit offered to affected customers
- Advertising Standards Authority guidance, for the requirement that in-contract price rise information is given equal prominence to headline pricing
- Office for National Statistics Consumer Price Index figures, for the January CPI used in inflation-linked increases
Network terms change regularly and increases are typically announced between December and February. Confirm the current position with your provider before relying on any figure in this guide.
