SIM-Only Deals in the UK for June 2026

EE consistently tops independent network tests for both urban and rural coverage. The network has expanded its 5G footprint to over 210 towns and cities across the UK. SIM-only plans include unlimited calls and texts as standard, with 5G bundled in at no extra cost. Premium plans add perks like Apple TV+ access.

✓ Best UK coverage Apple TV+ on select plans EU roaming available 210+ 5G towns

Best for: Rural users, frequent UK travellers, and anyone who demands the most reliable signal at all times.

O2 provides 99% 4G coverage and 5G in hundreds of towns and cities. Its O2 Priority loyalty rewards give members early access to tickets, restaurant deals and exclusive offers. O2 also launched 30-day rolling business contracts for up to 10 SIMs in 2026, with no minimum term. Unlimited plans include roaming across 75 countries with EU roaming free up to a 25GB fair-use cap.

O2 Priority rewards ✓ Roaming in 75 countries EU roaming free O2 WiFi hotspots

Best for: People who value loyalty perks and those who frequently travel to the US, Australia or Europe.

Vodafone is the strongest choice for international travellers. Its roaming packages cover 52 European destinations and up to 84 worldwide destinations on higher-tier plans. All pay-monthly SIM plans include 5G as standard. Premium unlimited tiers (Unlimited Xtra, Plus, and Premier) come with zero speed restrictions. The entry-level Vodafone Basics offers affordable 4G plans for budget-conscious customers.

✓ 84 worldwide roaming destinations 52 EU destinations 5G on all plans No speed cap on Premier

Best for: Frequent international travellers, remote workers abroad, and data-heavy users who want premium speeds without restrictions.

Three has been independently named the UK’s fastest 5G network by Ookla, and its unlimited plans reflect that — unlimited data from around £18/month is the most competitive price among the big four. Every plan includes unlimited calls, texts and 5G as standard. Three’s Go Roam benefit lets you use your allowance across more than 70 worldwide destinations at no extra cost, and Paramount+ is available on select plans via the Three+ rewards app.

✓ Go Roam: 70+ destinations UK’s fastest 5G (Ookla) Paramount+ on select plans Three+ rewards

Best for: Data-hungry users, streamers, remote workers using phone hotspots, and value-seekers who want the fastest 5G without a premium price tag.

giffgaff’s rolling monthly “goodybag” plans start from around £6/month and all include unlimited UK calls and texts. Every plan is 5G-ready and EU roaming is included free up to around 5GB per month. You can change your goodybag each month with no penalties.

✓ EU roaming free (up to 5GB) O2 WiFi hotspot access Change plan monthly

Best for: Flexible month-to-month users and EU holiday-goers who want roaming without paying extra.

SMARTY’s unique data discount feature gives you money back on your bill for any data you don’t use. Plans start from 5GB for around £6/month with no long-term commitment. All plans are 30-day rolling and 5G-ready on Three’s fast network. For pure data-per-pound value, SMARTY is hard to beat.

✓ Money back on unused data No long-term contract Three’s fastest 5G

Best for: Budget-focused users who want maximum data value and the flexibility to get money back on what they don’t use.

Sky Mobile adds a standout perk: data rollover. Unused data is stored in a “Piggybank” and can be used later — great if your usage varies month to month. Running on O2’s network means 99% 4G coverage and 5G access. All plans include unlimited calls and texts.

✓ Data Piggybank rollover O2 coverage (99% 4G) Sky app integration

Best for: Existing Sky TV/broadband customers, and anyone with variable monthly data usage who hates wasting their allowance.

BT Mobile uses EE’s market-leading network — same coverage, same 5G speeds, but often at a slightly lower price. Existing BT broadband customers receive a meaningful monthly discount when bundling. Unlimited plans include data rollover and Apple TV+ on premium tiers.

✓ EE’s best-in-class coverage BT broadband bundle discount 5G included

Best for: BT broadband subscribers and rural users who want EE’s coverage at a reduced price.

Tesco Mobile offers O2-quality coverage at competitive prices with the bonus of Tesco Clubcard points on every bill. The network has committed to no EU roaming fees, and 5G is available in a growing number of UK towns and cities.

✓ EU roaming — no extra charge Tesco Clubcard points O2 99% 4G coverage

Best for: Regular Tesco shoppers and EU holiday-goers who want reliable O2 coverage without paying a roaming premium.

iD Mobile consistently offers the most aggressively priced deals in the UK. You can pick up unlimited data for around £15/month on a 24-month plan — the cheapest unlimited deal available from any UK network. Running on Three’s network means you get the UK’s fastest 5G. Plans are available via Currys stores and online.

✓ UK’s cheapest unlimited plan Three’s fastest 5G Available via Currys

Best for: Price-first shoppers who want unlimited data at the lowest possible cost and don’t mind a 24-month commitment.