Money Guides
⏱ 4 min read
📅 Updated May 2026
SIM Only vs Pay Monthly UK 2026: Which Is Cheaper and Which Should You Choose?
| By Chandraketu Tripathi | Updated April 2026 |
| The choice between SIM-only and pay monthly (contract) is one of the most financially significant decisions mobile phone users make. SIM-only gives you a cheap monthly plan for a SIM card alone; pay monthly bundles a new handset into your monthly payments. On the surface, pay monthly seems convenient — but the true cost comparison usually tells a very different story. Here is a complete breakdown for 2026. |
Key facts April 2026 SIM-only from: £5/month (1GB) to £20/month (unlimited) | Pay monthly (inc handset): £25–£80/month | Typical 2-year saving on SIM-only: £200–£600 | Best time to switch: when your current contract ends |
SIM Only vs Pay Monthly: The Real Cost Comparison |
| The critical insight most people miss: pay monthly contracts charge you for the handset through inflated monthly bills — and crucially, the price rarely drops after the handset is paid off. Here is a real comparison using an iPhone 16 Pro Max: |
Prices based on April 2026 market rates. Actual savings vary by phone model and SIM deal chosen.| Option | Monthly cost | 24-month total | What you get |
|---|
| Pay monthly (iPhone 16 Pro Max, 100GB) | £65/month | £1,560 | Phone + SIM; phone owned outright after 24 months | | Buy iPhone 16 Pro Max outright + SIM-only (20GB) | £0 + £8/month = £8/month | £1,279 (phone) + £192 (SIM) = £1,471 | Same phone + SIM; £89 cheaper AND you own the phone | | Buy refurbished iPhone 15 Pro + SIM-only (20GB) | £0 + £8/month = £8/month | £750 (phone) + £192 (SIM) = £942 | Very similar phone; save £618 vs pay monthly | | Pay monthly (mid-range Android, 100GB) | £35/month | £840 | Phone + SIM; phone tied to contract | | Buy mid-range Android + SIM-only (20GB) | £0 + £8/month = £8/month | £350 (phone) + £192 (SIM) = £542 | Same phone; save £298 over 2 years | |
Best SIM-Only Deals UK April 2026 |
| Provider | Data | Monthly cost | Network | Contract | Best for |
|---|
| Smarty | Unlimited | £16/month | Three | 30-day rolling | Best value unlimited; hotspot included | | VOXI | Unlimited | £18/month | Vodafone | 30-day rolling | Under-30s; social media data exempt | | giffgaff | Unlimited | £20/month | O2 | 30-day rolling | Flexible; community support; O2 coverage | | Sky Mobile | Unlimited | £18/month | O2 | 30-day rolling | Data rollover; Sky TV bundles | | Three | Unlimited | £18/month | Three | 12-month | Go Binge streaming; good 5G | | Lebara | 5GB | £5/month | Vodafone | 30-day rolling | Budget; international calls included | | Tesco Mobile | 5GB | £7/month | O2 | 12-month | Clubcard discount; O2 coverage | | ID Mobile | 5GB | £6/month | Three | 30-day rolling | Data rollover; budget option | | EE | 100GB | £20/month | EE | 24-month | Best UK coverage; Apple Watch pairing |
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When Pay Monthly Makes Sense |
| SIM-only almost always wins on total cost, but there are genuine reasons to choose pay monthly: |
| Reason | Is it a good reason? | Alternative to consider |
|---|
| You cannot afford the upfront handset cost | Legitimate — but check the maths carefully | Consider buy now pay later (0% interest) for the phone separately | | You want a new phone every 2 years | Weak reason — you can sell your current phone to fund the next | Trade-in + SIM-only; often still cheaper overall | | You want the latest phone immediately without savings | Legitimate but expensive | Budget for a phone fund — £30/month saves £720 in 2 years | | Your credit score is thin and SIM-only requires a credit check | Sometimes — PAYG SIMs need no credit check; some SIM-only plans do | PAYG SIM; giffgaff; Smarty (minimal credit checks) | | Your employer pays for the contract | Not your money — convenience matters more | N/A — take the contract |
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When to Switch from Pay Monthly to SIM-Only |
- Check your contract end date: Most pay monthly contracts are 24 months. Your network must notify you 10–40 days before the end. Look for the notification or call to check.
- Text to switch (PAC code): Text PAC to 65075 (free). Your PAC code arrives by text within 60 seconds. Use it to port your number to a new SIM-only provider within 30 days.
- Compare SIM-only deals: Use comparison sites for your postcode — coverage varies by network.
- Switch: New SIM arrives in 1–3 days. Insert it, use PAC code when prompted. Your number transfers within 1 working day.
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| PAC code tip: Texting PAC to 65075 automatically alerts your current provider that you are leaving. They will often call to offer a better deal — compare this against the market before accepting. |
Key facts April 2026 SIM-only plans cost £5–20/month vs £25–80/month for pay monthly contracts including a handset. The typical saving over 2 years is £200–600 when you buy the phone separately. Switch to SIM-only when your current contract ends by texting PAC to 65075. Smarty and giffgaff offer the best value unlimited SIM-only plans in 2026. |
Frequently Asked QuestionsIs SIM only cheaper than pay monthly UK? Almost always yes. Pay monthly contracts bundle the handset cost into inflated monthly payments. Buying a phone separately and taking a SIM-only plan typically saves £200–600 over 2 years. The saving is largest on premium flagships like iPhone. How do I switch to SIM only in the UK? Text PAC to 65075 (free). You receive your PAC code within 60 seconds by text. Choose a SIM-only plan from a comparison site, give them your PAC code, and your number transfers within 1 working day. What is the best SIM-only deal UK 2026? For unlimited data, Smarty at £16/month on the Three network is the best value. For those wanting O2 coverage, giffgaff unlimited at £20/month is the top pick. For budget users, Lebara at £5/month for 5GB is hard to beat. |
| Related Guides |
| Sources: Ofcom mobile market data 2026, Smarty, giffgaff, Voxi, Lebara pricing April 2026, Uswitch SIM-only comparison, Which? mobile network ratings. April 2026. |
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The content on Kaeltripton.com is for informational and educational purposes only and does not constitute financial, investment, tax, legal or regulatory advice. Kaeltripton.com is not authorised or regulated by the Financial Conduct Authority (FCA) and is not a financial adviser, mortgage broker, insurance intermediary or investment firm. Nothing on this site should be construed as a personal recommendation. Rates, figures and product details are indicative only, subject to change without notice, and should always be verified directly with the relevant provider, HMRC, the FCA register, the Bank of England, Ofgem or other appropriate authority before any financial decision is made. Past performance is not a reliable indicator of future results. If you require regulated financial advice, please consult a qualified adviser authorised by the FCA.
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Chandraketu Tripathi
Finance Editor · Kaeltripton.com
Chandraketu (CK) Tripathi, founder and lead editor of Kael Tripton. 22 years in finance and marketing across 23 markets. Writes on UK personal finance, tax, mortgages, insurance, energy, and investing. Sources: HMRC, FCA, Ofgem, BoE, ONS.
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