SIM-only vs phone contract: which saves you money?
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Quick answer: SIM-only deals are almost always cheaper than phone contracts because you are not paying off a handset. Buy a phone outright (or keep your current one) and pair it with a SIM-only plan to save £200–£400 over a typical two-year period.
Phone contracts bundle a handset and airtime into one monthly payment, making the phone cost invisible. SIM-only plans sell just the airtime — minutes, texts, and data — at a lower monthly price. For most people, buying a phone separately and choosing SIM-only is the cheaper long-term option.
Skip this if: Skip SIM-only if you still owe handset instalments you cannot settle, or if you need a brand-new flagship with no cash upfront and accept paying more overall. Check social tariffs first if you claim Universal Credit or Pension Credit.
Last reviewed:
Read the full bills & utilities guide →Quick answer: What is a SIM-only deal? →Primary source: www.ofcom.org.uk/phones-and-broadband
Is SIM-only cheaper over two years?
A phone contract at £45 per month over 24 months costs £1,080 total. The same phone bought for £300 plus a £15 SIM-only plan costs £660 over 24 months — saving £420. Those figures are an illustration of the shape, not a live quote — check today's airtime and handset prices before you switch.
SIM-only plans from the same networks offer identical coverage and speeds. The only difference is you are not financing a handset.
| Route | What you pay | Usually better if |
|---|---|---|
| 24-month handset + airtime at £45/month | £1,080 over two years | You need a new phone with no cash upfront |
| £300 handset + £15/month SIM-only | £660 over two years | You can buy or keep an unlocked phone |
| Social tariff SIM-only | Often £10–£15/month if you qualify | You claim Universal Credit or Pension Credit |
When does a phone contract still make sense?
Contracts can suit people who want the latest flagship phone without a large upfront payment and who do not mind paying more overall. Some contracts include insurance and early upgrade options that may suit people who drop or lose phones frequently.
How do you switch to SIM-only and keep your number?
When your phone contract ends, do not auto-renew. Your handset is paid off, so switch to SIM-only and keep the phone. Request a PAC (text PAC to 65075) from your current provider and give it to the new SIM-only provider. Do not cancel before the port completes.
Common questions
Can I use any phone with a SIM-only plan?
Yes, if the phone is unlocked or locked to the same network. Check compatibility — most modern phones work on all UK networks.
Is SIM-only credit checked?
Some providers credit-check for 12-month SIM-only plans. 30-day rolling plans usually do not require a credit check.
What happens when my phone contract ends?
You have paid off the handset. Switch to SIM-only immediately — continuing on the same plan means you are paying for a phone you already own.