Hand holding SIM card

5G SIM Only Deals UK

Compare 5G SIM only deals: blazing-fast 5G on the UK's top networks, no handset cost, no lock-in.

Why Choose a 5G SIM Only Deal?

Most people in the UK are overpaying for mobile. The biggest reason? Staying on an old phone contract after the handset is paid off. Once your 24-month deal ends, you're effectively paying for a phone you already own, often £20 to £30 a month extra.
Moving to a 5G SIM only plan fixes that instantly:
  • No handset cost: keep your existing phone and only pay for airtime
  • 5G speeds: download films, stream HD video, and video call without buffering
  • Flexible contracts: choose 1-month rolling plans or save more with 12 or 24-month deals
  • No credit check options available on many 30-day rolling plans
  • eSIM support: many UK networks now let you activate instantly with a digital eSIM
Switch compares 5G SIM only deals UK-wide from EE, O2, Three, Vodafone, Sky Mobile, giffgaff, SMARTY, iD Mobile, Tesco Mobile and more, every option in one place, ranked by value.

How Much Can You Save by Switching to 5G SIM Only?

Savings based on typical UK market prices as of 2026. Individual results depend on your chosen network and plan.

SituationTypical Monthly Cost5G SIM Only AlternativePotential Monthly Saving
Staying on ended 24-month phone contract£35 to £55/month5G SIM only plan (same network)£15 to £30/month
Old 4G SIM only plan£8 to £15/monthNew 5G SIM only deal£2 to £8/month
Unlimited data on older contract£30 to £45/month5G unlimited SIM only£10 to £20/month

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How 5G SIM Only Deals Work

A 5G SIM only deal gives you a mobile plan with calls, texts, and data, without including a handset. You keep your current phone and slide in your new SIM (or activate an eSIM). As long as your device is 5G-compatible and you're in a 5G coverage area, you'll instantly access faster speeds.
Three things you need to use 5G:
  • A 5G-compatible phone: most devices released since 2020 are 5G-ready. Check your phone's spec sheet or the network's compatibility checker.
  • A 5G SIM or 5G plan from a UK network: all major networks and most MVNOs now include 5G as standard at no extra cost on SIM only plans.
  • A location with 5G signal: 5G is live across all major UK cities and hundreds of towns. Check your postcode using the Ofcom coverage checker at checker.ofcom.org.uk.
If your phone is 4G only, a 5G SIM will still work, you'll just connect at 4G speeds. No harm in getting a 5G plan now so you're ready when you upgrade.

5G Network Comparison: UK Providers at a Glance

At least 15 UK networks offer 5G SIM only deals, including major operators and smaller MVNOs running on the same masts at lower prices.

Network5G CoverageNotable PerkBest For
EEWidest UK coverageInclusive Extras: Netflix, Apple Music, Google OneCoverage + perks
Three303+ UK locations; fastest avg 5G speeds5G as standard on all SIMs; Three+ rewardsSpeed + value
O2200+ UK locationsO2 Priority rewards; EU roaming on select plansRoaming + rewards
VodafoneMajor UK cities + 5G Ultra (10x faster than 4G)European roaming (52 destinations); eSIM supportSpeed + roaming
Sky Mobile2,000+ UK locationsData rollover; flexible piggyback plansFlexibility
giffgaff200+ UK locations (O2 masts)No credit check; cancel anytimeFlexibility + budget
SMARTYThree's networkNo contracts; no mid-contract price hikes; pay upfrontNo commitment
iD MobileThree's networkBudget 5G; data rolloverBudget speed
Tesco MobileO2 network; 5G in 2,000+ townsNo EU roaming fees; Clubcard rewardsShoppers + travellers

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How to Choose the Right 5G SIM Only Deal

The best 5G SIM only deals uk aren't always the cheapest; they're the ones that match how you actually use your phone. Five things to check before you compare.

1

How Much Data Do You Need?

The average UK user consumes 10.6GB/month (Ofcom 2025). Check your own average over the last three months. Light users (under 5GB) save most with a standard plan. Heavy users (20GB+) or daily video streamers should consider unlimited.

2

Contract Length

30-day rolling plans let you cancel or switch any month, ideal if deals change. 12-month plans are slightly cheaper per month. 24-month deals offer the lowest monthly cost if you're settled on a network.

3

Check 5G Coverage at Your Postcode

5G is live across all major UK cities but coverage varies street by street. Always check your home and work postcode before committing. Use checker.ofcom.org.uk or the network's own coverage map.

4

Physical SIM or eSIM?

Most networks support eSIM, a digital SIM that activates without a physical card. eSIMs are faster to activate, can't be lost or stolen, and produce no plastic waste. Supported by most modern iPhones and Android flagships.

5

Mid-Contract Price Rise Clauses

Some UK networks include annual inflation-linked price increases mid-contract. SMARTY and Lebara offer no mid-contract hikes. Sky Mobile pricing is variable. Switch flags this clearly alongside each deal price.

How to Compare 5G SIM Only Deals UK on Switch

Switch makes comparing 5G SIM only deals UK simple and free. Here is how it works:

1

Enter Your Data Usage and Postcode

Check your phone's data usage screen for your average over the last three months. Enter this alongside your postcode so Switch can filter deals available in your area.

2

Filter to Match Your Needs

Filter by contract length, data allowance, network, 5G availability, roaming, and monthly budget. Switch shows every 5G SIM only deals UK option, including MVNOs, without hiding cheaper alternatives.

3

Compare Full Monthly Costs Side by Side

Results show total monthly cost, data allowance, 5G status, contract terms, and any mid-contract price rise clauses. No introductory pricing tricks: you see the real cost from month one.

4

Activate Online in Minutes

Click through to your chosen deal and complete sign-up online. Choose a physical SIM (arrives in 1 to 3 working days) or eSIM (activates immediately). Keep your number by providing your PAC code at sign-up.

Switch is free to use and fully independent. Results are not sorted by commission, they are sorted by value.

Special Situations: Can I Still Get a 5G SIM Only Deal?

Common questions about eligibility, number porting, credit checks, and phone compatibility, answered plainly.

SituationShort AnswerWhat to Do
Want to keep my numberYes, free and straightforwardText PAC to 65075 (free). Give code to new network at sign-up. Transfers within 1 working day.
Need no credit checkYes, several options availableSMARTY, giffgaff, and Lebara offer 30-day rolling plans with no credit check. Pay upfront, approved instantly.
Still in a phone contractCheck exit date firstMost contracts include an exit fee if you leave early. Once your contract ends (or in the final 30 days), move to SIM only with no penalty.
Phone might not be 5G-compatibleA 5G SIM still works on 4G phonesIf your phone is 4G only, a 5G SIM connects at 4G speeds. You'll access 5G automatically when you upgrade your handset.

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5G Coverage in the UK: What You Need to Know

5G is live across all major UK cities and hundreds of towns including Aberdeen, Bath, Belfast, Birmingham, Bradford, Brighton, Bristol, Cardiff, Derby, Edinburgh, Glasgow, Leeds, Leicester, Liverpool, London, Manchester, Newcastle, Nottingham, Oxford, Portsmouth, Sheffield, Southampton, York, and many more.
The UK's 5G maximum recorded speed in formal tests reached around 915Mbps. Real-world average speeds typically range from 80 to 210Mbps depending on your network and location, 3 to 8 times faster than 4G, making a real difference for video calls, streaming, and large downloads on the go.
Coverage is expanding every quarter. Always check your home and work postcode before committing to a network: use the Ofcom coverage checker at checker.ofcom.org.uk or the network's own postcode tool. If only one network covers your area well, focus on that network's plans and any MVNOs that run on the same infrastructure.

Compare 5G SIM Only Deals UK Now: Free on Switch

Switch compares every major UK 5G SIM only deal in real time: no bias, no hidden fees, no obligation. Enter your data usage and postcode, filter to match your needs, and find the plan that gives you the most for your money.

The best 5G SIM only deals UK go fast. Compare now and switch in minutes.

Compare 5G SIM DealsSIM Only DealsMobile PhonesCall: 01926 942125

FAQs

What is a 5G SIM only deal?

A 5G SIM only deal gives you a monthly mobile plan with data, calls, and texts on a 5G-capable network, without including a phone. You keep your existing handset and only pay for the airtime. It's the cheapest way to access 5G if you already own a compatible device.

Do I need a new SIM card to get 5G?
Is 5G included free on SIM only plans?
How much data do I need on a 5G SIM only plan?
Can I get unlimited 5G data on a SIM only deal?
What is an eSIM and can I use it on a 5G plan?
Will 5G drain my phone battery faster?
How often should I compare 5G SIM only deals?
Can I keep my number when switching to a 5G SIM only deal?
Can I get a 5G SIM only deal without a credit check?
What if I'm still in a phone contract?
Does 5G SIM only work with any phone?

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