Most of us know we should be paying less for our mobile phones. Yet year after year, millions of people in the UK continue to hand over more money than necessary. The reasons are rarely dramatic. They are usually a mix of habit, convenience and a few quietly expensive mistakes that networks are happy to let slide.
Here is a clear-eyed look at why so many of us are still overpaying in 2026 and what the data shows.
1. Staying on the same expensive contract long after the phone is paid off
This remains one of the most common (and costly) errors. Many people sign up for a 24-month deal that bundles the handset and airtime. Once the handset portion is paid off, the monthly bill should drop to a pure airtime rate. On some providers particularly certain resellers it simply does not. You keep paying the higher combined figure for a phone you already own.
Martin Lewis has repeatedly called this out as a “dirty trick.” The difference can easily run to £20 or more a month over £240 a year of pure waste if you do nothing when the contract ends.
2. Ignoring the SIM-only option when the phone still works
Switching from a typical ending handset contract to a comparable SIM-only plan can save around £262 a year, or roughly £22 a month. That figure comes from real-market comparisons of popular packages.
Yet large numbers of people still roll into another full contract the moment their current one finishes. The phone is working perfectly well. The data allowance is more than enough. The only thing that has changed is the calendar.
3. Buying far more data than they actually use
Unlimited data plans are marketed heavily and feel safe. In reality, the average UK mobile user still consumes far less than the high-end packages many pay for. Meanwhile, solid 50–100GB SIM-only deals sit in the £8–£15 range, and even lighter plans are available for under a fiver. Paying for data you never touch is one of the quietest ways to overspend.
4. Accepting the first trade-in or upgrade offer without shopping around
Network trade-in values are convenient but rarely the best available. Independent recyclers frequently pay noticeably more in cash sometimes 30% higher on popular iPhone models. Accepting the network’s first offer without checking alternatives is an easy way to leave money on the table.
The same principle applies to the new deal itself. Loyalty rarely earns you the best price. New-customer offers and comparison-site exclusives are often stronger.
5. Overlooking mid-contract price rises
Ofcom now requires providers to state any mid-contract increases in clear pounds and pence at the point of sale. That transparency is helpful but only if people actually read it and factor it into the total cost. Many still focus on the attractive starting monthly price and only notice the rises once they appear on the bill.
Over a 24-month term those fixed annual increases of £1.50–£2.50 (or more) add up.
6. Treating the phone bill as fixed rather than negotiable
A surprising number of people never check what they are paying relative to the open market. They assume their current network is “good enough” or that switching will be complicated. In practice, number porting is straightforward, coverage on major MVNOs is usually identical to the host network, and the savings can be substantial.
The Bigger Picture
None of these mistakes require special knowledge or hours of research. Most can be avoided with a short comparison once a year and a willingness to treat the mobile bill like any other household cost that should be reviewed.
The market in 2026 makes it easier than ever to stop overpaying. Cheap SIM-only plans are widely available, trade-in competition is strong, and the tools to compare total costs exist. The barrier is usually inertia rather than lack of options.
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Most people overpay because they never look. A quick check is often all it takes to change that.
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