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10 Best Sim Only Deals UK – Compare Cheap Plans & Offers

10 Best Sim Only Deals UK – Compare Cheap Plans & Offers

In this article, I researched the Best SIM Only Deals UK so that you can use your mobile phone affordably and flexibly without having to buy a new device.

Whether you require generous amounts of data, excellent network coverage, or unique advantages, these deals cater to all needs. Let us evaluate the leading providers and what makes their SIM-only plans unique in the UK market.

key Points & Best Sim Only Deals UK List

NetworkKey Point
Vodafone SIM-onlyExtensive coverage and reliable network
VOXIYouth-focused, flexible plans with social media perks
Lebara SIM-onlyAffordable international calls and data
LycamobileGreat for international calls, competitive prices
Tesco MobileRuns on O2 network, offers Clubcard points
Sky MobileRolling data plans, easy data sharing
Honest MobileBudget-friendly, simple plans with fair usage
SMARTYPay-as-you-go style with unused data cashback
iD MobileRuns on Three network, competitive data offers
GiffgaffCommunity-driven, flexible plans with no contracts

10 Best Sim Only Deals UK

1.Vodafone SIM-only

Vodafone SIM only deals are amongst the best in the UK market considering their deals are backed by reliable 4G and 5G coverage across the country. They offer various packages, catering from light users to heavy data consumers.

Vodafone SIM-only

Customers are able to enjoy fast speeds, inclusive roaming in various destinations, and even some entertainment subscriptions on select plans.

For those seeking contracts, the reason Vodafone is a top choice is because of their wide coverage giving them constant connectivity. With the competitive pricing of the SIM deals offered along with the regular promotions, they are a great addtion for mobile users in the UK.

FeatureDetails
Network CoverageExtensive UK 4G & 5G coverage
Plan FlexibilityMultiple data allowances, from light to heavy users
RoamingInclusive roaming in many countries
ExtrasEntertainment subscriptions on select plans
Contract OptionsMostly flexible, some 30-day or longer contracts
ReliabilityStrong and stable network

2.VOXI

VOXI combines flexibility and affordability with some of the best sim only deals in the UK. VOXI users are offered great coverage and 5G speeds, courtesy of Vodafones award winning network.

A defining feature of VOXI plans is ‘Endless Social’, which allows users to tweet, tag, and scroll through Instagram without it affecting their data allowance.

VOXI

In addition, VOXI plans come with unlimited calls and texts ranging from 8GB to 300GB of data. Most plans offered by VOXI are contract-free, meaning you can cancel anytime. Heavy data users may find the £20/month plan boasting 300GB of data appealing.

For mildly heavy data users, the £12/month plan comes with 75GB of data and unlimited video streaming on YouTube and Netflix for £12 a month. VOXI refuses to raise prices mid contract, making them ideal for customers looking to save money.

FeatureDetails
Network CoverageVodafone’s 4G & 5G network
Youth-FocusedPlans aimed at younger users
Endless SocialUnlimited social media use without data cost
ContractNo contract, cancel anytime
Data PlansRange from 8GB to 300GB
Streaming PerksUnlimited video streaming on some plans

3.Lebara SIM-only

One of the most affordable SIM-only deals in the UK can be found with Lebara, as they offer great flexibility alongside no credit checks. Their plans are powered by Vodafone, which guarantees both coverage and 5G access.

For example, for £5/month, you can get 5GB of data, 1000 minutes, and 1000 texts, as well as 100 International minutes to over 40 countries. Another popular option is the £8/month which comes with 20GB of data and unlimited UK calls and text as well as 100 International minutes.

Lebara SIM-only

Unlike other mobile providers, Lebara Mobility offers contract-free terms. This allows customers to switch or cancel whenever they want.

They also provide EU roaming and don’t increase prices mid-contract, which is why Lebara is in high-demand from cost-conscious customers who desire flexibility, international calling options, and coverage.

FeatureDetails
Network CoverageUses Vodafone network for 4G/5G
Affordable International CallsIncludes international minutes to 40+ countries
ContractPay-as-you-go or no contract
Data OptionsVarious data allowances
RoamingEU roaming included
No Credit CheckSuitable for all credit types

4.Lycamobile

Lycamobile has some of the best SIM-only plans in the UK such as The UK Plan Smart which includes 5 GB of data, unlimited calls, 100 international minutes, and is available for £5 per month. Additionally, the National Plus plan includes 20GB for £5 the first month and £10 for subsequent months.

Lycamobile

It is important to note that students get 15GB for £3, and family plans start from £20 for a month. Other benefits include EU roaming, 5G access, no credit checks, cancel anytime policies, and flexibility with rolling 30 day plans.

FeatureDetails
Network CoverageOperates on major UK networks with 5G
Flexible PlansRolling 30-day plans, no long contracts
International CallsCompetitive rates, includes international minutes
Data PlansFrom low to high data options
RoamingFree EU roaming
Special OffersStudent discounts and family plans

5.Tesco Mobile

Tesco Mobile provides an assortment of SIM-only deals that are strikingly competitive for all data requirements and budgets throughout the United Kingdom. Their plans are also structured on a rolling 30-day basis so you can pay monthly without being locked for long periods.

For instance, the “UK Plan Smart” comes with 5GB of data, unlimited UK calls and texts, and 100 international minutes for only £5 a month. The “National Plus” plan also provides 20GB of data and starts at £5 for the first month and then shifts to £10 monthly after that.

Tesco Mobile

All plans are made available with EU roaming and 5G at no extra charge. Moreover, Tesco Mobile has special promotions such as £3 students per month for 15GB and family plans starting from £20 for 30 days. As there are no credit checks and the ability to cancel anytime, Tesco Mobile serves good value in the budget domain for flexible plans.

FeatureDetails
Network CoverageUses O2’s 4G & 5G network
Flexible PlansRolling monthly plans
Clubcard RewardsEarn Tesco Clubcard points with usage
Data OptionsMultiple data packages
RoamingFree EU roaming
No Credit ChecksEasy sign-up

6.Sky Mobile

Sky mobile provides flexibility with some of the best SIM only deals in the UK. It offers good value for money with its unique features. The company offers 12-month contracts that include calls and texts with data ranging from 3GB to unlimited. This is all offered on O2’s 5G network.

The company also provides a unique feature known as ”Piggybank’ where unused data can rol lover for up t three years and is shareable with family. This is in addition to being used later.

Sky Mobile

The 40GB plan costs £12/month while the 100GB plan is offered at £18/month. Sky mobile also sells loyalty to Skytv customers because they can now stream Skytv apps for free without consuming data. They can change plans and do not face surge in pricing which makes the deals beneficial.

FeatureDetails
Network CoverageO2 4G & 5G network
Data RolloverUnused data rolls over for up to 3 years
PiggybankShare data with family or save for later
Flexible Contracts12-month contracts with no price hikes
PerksUnlimited Sky app streaming for Sky TV customers
Data Plans3GB to unlimited

7.Honest Mobile

Honest Mobile takes a new approach to SIM-only deals in the UK by striking a balance between competitive offer pricing and environmental sustainability.

They provide plans with inclusive UK calls and texts for £6.75/month for 4GB of data, £8.75/month for 10GB, and £12.50/month for unlimited data.

One of their best features is the loyalty discount that lowers your bill by 5% annually, up to a 30% maximum. Furthermore, Honest Mobile provides 5 days of free EU roaming per trip, unlimited UK tethering, and WiFi calling.

Honest Mobile

With Three’s 5G network, customers also get access to reliable and fast services throughout the UK. Eco-friendly users will appreciate that Honest Mobile is a carbon negative network, taking the green initiative of offsetting emissions and planting trees as part of their network’s footprint.

For mobile users looking for value, sustainability, and ease-of-use policy, Honest Mobile offers flexible 30-day or 12–month contracts with clear pricing and no hidden fees.

FeatureDetails
Network CoverageThree 5G network
PricingBills reduce by 5% each year (up to 30%)
Plans4GB, 10GB, unlimited data
Roaming5 days free EU roaming per trip
Hotspot UseUnlimited UK hotspot usage
SustainabilityCarbon-negative network, offsets emissions

8.SMARTY

Focused on value and flexibility, SMARTY provides some of the most affordable SIM-only plans in the United Kingdom.

Customers using SMARTY enjoy 4G and 5G network access through Three’s infrastructure. SMARTY deals offer contract-free plans which means there are no changes to fees for cancelling or altering plans.

SMARTY

One of their most popular services is the data discount program: you will get £1 back per GB of data not used on your next bill, this means paying for utilized services only.

They offer plans starting from £5 for 10GB of data up to £16 for unlimited data. Furthermore, they do not perform credit checks, allow EU roaming and tethering, and unhindered tethering and all these make SMARTY an ideal option for users on a budget.

FeatureDetails
Network CoverageThree 4G & 5G network
Data Discount£1 cashback per unused GB
PlansFrom 10GB to unlimited
ContractNo contract, cancel anytime
RoamingFree EU roaming
TetheringUnrestricted hotspot use

9.iD Mobile

iD Mobile is one of the most affordable providers in the UK when it comes to sim-only contracts. Their plans are very flexible, year-on-year price increases are nonexistent, and they offer good value for money.

iD’s mobile contracts run on the Three 5G network which guarantees high positive reviews for their data services, network coverage, and speed. For 6 pounds a month, customers get 20GB of data, unlimited minutes, and unlimited texts on a monthly contract.

iD Mobile

There’s also a 110GB plan available for £10 a month on a one-month contract for those who require additional data. All plans feature no roaming fees in over 50 countries, data rollover, and bill capping which help manage potential expenditure.

Even with ido’s most basic plans, the mobile operator offers flexibility, cost-efficiency, and caters to both light and heavy mobile users. No price hikes during contracts and consistent networks further advance iD’s position as the best sim-only plan provider in the UK.

FeatureDetails
Network CoverageThree 5G network
Price GuaranteeNo annual price rises
PlansFrom 20GB to 110GB data
ContractMonthly rolling contracts
RoamingFree roaming in 50+ countries
Data RolloverAllows rollover of unused data

10.Giffgaff

Giffgaff is known to have some of the cheapest SIM only deals for budget users in the UK, as one is able to get value without needing to subscribe to long-term contracts. Giffgaff operates using O2’s 5g network meaning that they have good coverage as well as fast data speeds.

Their plans do not come with contracts, hence customers can change or cancel anytime. For example, the £6/month comes with 2GB of data, unlimited call and texts in the UK and 5G.

Giffgaff

Those who need more data can get the £10/month plan which offers 20GB or the £15/month plan which offers 35GB of data. EU roaming is included in all plans and there is no price increase for mid contract downgrading.

Moreover, Giffgaff has this unique ‘Always On’ plan for £25 a month that comes with unlimited data but 80 GB running at full data speeds, then capped at lower speeds during peak time. The ability to switch plans every month without undergoing a credit check makes Giffgaff the best choice for users looking to save money.

FeatureDetails
Network CoverageO2 4G & 5G network
Plan FlexibilityPay monthly, cancel anytime
Plans2GB to unlimited data (with speed restrictions)
RoamingFree EU roaming
Unique Plan“Always On” unlimited data with speed limits
Community SupportCommunity-driven customer support

Conclusion

In Conclusion: If you are on the lookout for the best SIM-only deals in the UK, remember that each mobile provider excels in different services: Sperate offers reliability with bonuses on Vodafone and Sky Mobile; VOXI and Giffgaff superb flexibility

Lebara and Lycamobile fantastic international calling; eco-friendly customers are swayed by Honest Mobile; SMARTY and iD Mobile are valued for cheap prices with high data allowances. Pick the one that is the best fit from the perspective of coverage, budget, and additional perks.

FAQ

What is a SIM-only deal?

A SIM-only deal provides a SIM card with mobile service—calls, texts, and data—without a new phone. It’s ideal if you already have a phone and want flexible, cost-effective plans.

Which network has the best coverage in the UK?

Vodafone, O2 (used by Sky Mobile and Tesco Mobile), and Three (used by SMARTY and iD Mobile) offer the widest and most reliable 4G and 5G coverage.

Are SIM-only plans cheaper than phone contracts?

Yes, SIM-only plans are usually cheaper since you’re not paying for a new device, making them great for budget-conscious users.
Nancy P. Howard has been working as a journalist at an online magazine in London for a year. She is also a professional writer in such topics as blogging, IT and marketing.