Best SIM-only deals UK 2026
SIM-only is a no-brainer for anyone who already owns their phone. Here's how to spot a genuine bargain vs a headline price with hidden gotchas.
The short answer
The best SIM-only deals are rolling monthly, include enough data for your usage without huge overage costs, and don't sting you for EU roaming. OCCTA plans start from £8/mo.
Rolling monthly beats 12/24-month tie-ins
Rolling monthly means you can leave any time. If your usage or the market changes, you're not stuck.
Match data to actual usage
Most people use 10–30GB/month. Check your last three bills before buying an unlimited plan you don't need.
5G coverage and speeds
5G is now widespread in UK cities. Look for a SIM on a 5G network if you want fast mobile data indoors and out.
EU roaming rules
Since Brexit, roaming isn't automatically free. OCCTA SIM plans include fair-use EU roaming so you don't come home to a shock bill.
FAQs
Next step
Find out what's available at your address, or talk to a human about your setup.