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Part of:
Best Broadband and Mobile UK 2026
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Key facts (2026): The best SIM-only deals in the UK offer 100GB+ data for £10–£20/month from providers including iD Mobile, SMARTY, Lebara, and VOXI. 24-month contracts for new flagship handsets (iPhone 16, Samsung S25) start at £40–£70/month. Refurbished handsets with SIM-only deals can save £30–£50/month versus buying new on contract.
Mobile phone bills are one of the most overpaid expenses in UK households. Millions of people continue paying the same contract rate after their handset cost has been recouped — effectively paying for a phone they already own. Understanding when to switch to SIM-only and how to compare deals correctly saves most households £200–£500/year.
SIM-Only vs Contract — The Key Difference
A contract deal bundles your handset cost and your airtime into one monthly payment. Once the contract period (typically 24 months) ends, the handset is paid off but most people continue paying the same price — effectively overpaying for airtime they could get for a fraction of the cost on a SIM-only plan. Check when your current contract ends. If your handset is paid off (typically after 24 months), switching to a SIM-only deal immediately saves significant money.
Best SIM-Only Deals UK 2026
SMARTY (uses Three network): unlimited data from £19/month. iD Mobile (Three network): 100GB from £8/month. VOXI (Vodafone): unlimited social media data, 150GB from £15/month. Lebara: 30GB from £5/month (ideal for light users). Sky Mobile: roll-over unused data, competitive on price for existing Sky customers. Always use Uswitch or MoneySupermarket to compare — deals change frequently.
Mid-Contract and Switching
If you want to exit a contract early, check your remaining handset payments — the exit fee is typically the remaining months × monthly cost. For many people approaching the end of a 24-month contract, waiting until month 24 and then switching to SIM-only is the most financially rational move. Number porting (keeping your number when switching) is free and takes approximately 1 working day via a PAC code from your current provider.
Our Verdict
The single biggest mobile saving for most UK consumers is switching to SIM-only after their 24-month contract ends. On a £50/month contract, switching to a £12/month SIM-only deal on the same network saves £456/year for identical service. Set a calendar reminder for your contract end date and compare SIM-only deals on Uswitch one month before it expires.
Frequently Asked Questions
What is the best SIM-only deal UK 2026?
SMARTY offers unlimited data from £19/month. iD Mobile offers 100GB from £8/month. Compare on Uswitch for the current best deal in your area.
Should I get a SIM-only deal?
If your current handset contract has ended (typically after 24 months), switching to SIM-only saves significant money — often £30–£50/month for the same or better service.
How do I switch mobile network UK?
Get a PAC code from your current provider (free, takes minutes via text or app). Give it to your new provider — your number transfers within 1 working day.
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Disclaimer: For informational purposes only. Verify with official sources before making decisions.
Last updated: April 2026 · Author: Chandraketu Tripathi
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