Mobile Contract Ending? Why Switching to SIM-Only Could Save You Hundreds in 2026
Once your phone is paid off, staying on the same 'handset + airtime' contract means you're often still paying the phone price even though it's fully yours. Here's how to spot it and switch to a cheaper SIM-only deal.
The Hidden Overpayment: Handset Cost After It's Paid Off
A typical 24- or 36-month mobile contract splits your monthly bill into two components, even if the network doesn't show this breakdown clearly:
| Component | What It Covers |
|---|---|
| Device plan | The handset cost, spread across the contract term |
| Airtime plan | Calls, texts, and data allowance |
Once the contract term ends, the device plan portion should, in principle, stop — you've paid for the phone in full. But unless you actively switch to a SIM-only deal (or the network automatically reduces your price, which not all do reliably), you can keep paying the full bundled rate indefinitely, effectively paying for a handset you already own.
Worked Example: The Cost of Not Switching
| Scenario | Monthly Cost | Annual Cost |
|---|---|---|
| Legacy handset + airtime contract (handset paid off, not switched) | £35/month | £420/year |
| Equivalent SIM-only plan (same data/calls/texts allowance) | £12/month | £144/year |
| Annual overpayment for staying put | £276/year |
Multiply this across the average person's phone-owning lifetime, and staying on legacy bundled pricing after the handset is paid off can cost hundreds of pounds over just a few years.
How to Check Where You Stand
- Check your bill or account for the original contract length and start date — has your minimum term already ended?
- Contact your network (or check your online account) to ask directly: "Is my handset paid off, and can I move to a SIM-only plan?"
- Compare your current monthly cost to live SIM-only deals for a similar data/call/text allowance, from your current network and competitors.
- If your handset isn't yet paid off, work out the remaining handset cost separately — you may still want to wait until the full term ends, or check if early upgrade/payoff options make sense.
Switching to SIM-Only: The Process
- Unlock your phone, if not already unlocked — most networks unlock automatically once the contract ends, or on free request under current rules.
- Get a PAC code (Porting Authorisation Code) to keep your number: text "PAC" to 65075 from the number you want to keep, and you'll receive a code by text within minutes.
- Choose a SIM-only deal — compare data allowance, network coverage in your area, and contract length (rolling monthly plans offer maximum flexibility; 12-month plans are often slightly cheaper).
- Give the PAC code to your new provider — the switch typically completes within one working day, and your old contract closes automatically as part of the process.
SIM-Only vs New Handset Contract: Total Cost Comparison
| Approach | Handset Cost | Airtime Cost (24 months) | Total Cost (24 months) |
|---|---|---|---|
| Handset + airtime bundle (popular flagship phone) | Built into monthly price | Built into monthly price | ~£1,200 |
| Buy handset outright (SIM-free) + SIM-only plan | ~£700 upfront | ~£288 (£12/month × 24) | ~£988 |
| Buy previous-generation/refurbished handset + SIM-only plan | ~£350 upfront | ~£288 | ~£638 |
Bundled contracts fold the handset financing cost into the monthly price, often at an effective interest rate that isn't disclosed as clearly as a personal loan would be. Buying the handset separately — new, refurbished, or on a standalone 0% finance deal — and pairing it with a competitive SIM-only plan is frequently the cheaper route overall, though it requires the upfront capital or a separate finance arrangement for the handset.
Don't Forget: Family/Multi-SIM and Data Rollover
When comparing deals, check whether:
- Multi-SIM family discounts are available if several people in your household are switching together.
- Unused data rolls over to the next month (some SIM-only deals include this, some don't). 5G access is included as standard or requires a plan upgrade, if that matters to you.
- The network's coverage is genuinely good in the areas you use your phone most — a slightly pricier plan on a network with better local coverage can be worth more than the cheapest possible deal on a network with poor signal where you live and work.
Frequently asked questions
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