Best unlimited data SIM only deals UK 2026
Unlimited data plans range from £12-30/month in the UK. The cheapest come from budget MVNOs running on major network infrastructure — equivalent signal at a fraction of the direct network price.
Best unlimited SIM plans — July 2026
Chattr Unlimited — from £12/month on Three
The UK's cheapest unlimited plan. Three has strong 5G speeds in cities but weaker rural coverage than EE. Best for urban users. 30-day rolling.
Mozillion Unlimited — from £15/month on EE
Unlimited on EE — the UK's best coverage network. EU roaming included. 30-day rolling. The strongest overall unlimited plan for users who want the widest coverage.
Ecotalk Unlimited — from £15/month on EE
Unlimited on EE, EU roaming, carbon neutral, 30-day rolling. Ecotalk offsets emissions and plants trees — popular with environmentally conscious users.
Do you actually need unlimited?
Most people overestimate usage. Check first: iPhone → Settings → Mobile Data → scroll to see monthly usage. Android → Settings → Network → Data usage.
Under 15GB/month: Mozillion 25GB at £8/month saves £7-15/month vs unlimited. Switch only if you consistently exceed your allowance.
15-25GB/month: A 25GB plan usually works with occasional tight months. Unlimited only makes sense if you routinely exceed 25GB.
Over 25GB/month or unpredictable: Unlimited genuinely makes sense — peace of mind and hotspot freedom justify the cost.
Hotspot tethering
All UK unlimited plans allow tethering but typically apply a fair use policy — often 20-30GB of hotspot data per month even on unlimited. Check specific terms before relying on unlimited tethering as home broadband replacement.
5G on unlimited plans
All plans above include 5G where available on their network. EE (Mozillion, Ecotalk) has the UK's most extensive 5G rollout per Ofcom's network data.
The real cost comparison
EE direct unlimited: approximately £35/month. Mozillion unlimited on EE: £15/month. Annual saving: £240 — for identical coverage and signal quality.
Compare unlimited SIM plans on GadgetRank →
Is unlimited data worth it for you specifically?
The honest test: look at your last three months of data usage in your phone settings. If you consistently use over 25GB per month — unlimited makes sense. If you are under 20GB most months, a 25GB plan at £8/month (Mozillion) is significantly cheaper.
Many people switch to unlimited after one month of exceeding their allowance, when a top-up would have been cheaper than paying for unlimited all year. Calculate your annual cost under both scenarios before committing.
Budget networks on EE offer unlimited plans starting from £15/month — and EE's network quality means no compromise on signal. You pay less and get the same coverage as major network unlimited contracts at £30-40/month.
Compare unlimited SIM plans on GadgetRank →
Why compare on GadgetRank?
GadgetRank is an independent UK comparison site — not affiliated with any retailer, recycler or network. Every comparison is based on live price data. There are no paid placements or sponsored rankings. The best current offer appears at the top because it is the best current offer, not because of any commercial arrangement.
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