10 Best Sim Card in The UK

Last updated on 02/08/2025

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O2 Data Sim Card Preloaded with UNLIMITED 4G/5G Data. Includes 25GB to Roam for Free in 47 Countries. No Contracts, No Commitments, No Credit Checks, No Tie-ins, No Personal ID. (Valid for 1 Month).

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Why We Love It

Unlimited 4G/5G data preloaded.
No contracts or commitments.
Supports free international roaming.

Main Highlights

PRELOADED DATA: O2 SIM Card Preloaded with UNLIMITED 4G/5G Data. Enjoy Super-Fast 4G/5G Data Speeds with the UK’s most reliable network. The Data Sim Bundle lasts for 1 month from first use. Easy to renew your bundle for longer
NO CONTRACTS: The Preloaded O2 Data SIM Card is simple to activate. There are No Contracts, No Commitments, No Credit Checks, No Tie-ins & No Personal ID required
FREE ROAMING: Includes 25GB of Data which can be used to Roam for Free in any of the 47 countries listed in the description below. So whether you are on Holiday, a Business Trip or Working from Home, you can count on the Preloaded O2 4G/5G Data SIM for reliable & super-fast internet
MULTIPLE USES: The Sim comes in a Triple-Sized format, meaning it is suitable for use with all O2 or Unlocked Mobile Wi-Fi devices, Routers, Tablets, iPads, Dongles, Laptops, Mobile Phones, CCTV & Alarm systems. Tethering & Mobile Hotspots are also supported
SPEED YOU WILL LOVE: Working from Home, Streaming Online, Gaming, Scrolling through Social Media - The O2 4G/5G Preloaded SIM card provides amazing performance without any speed restrictions

Lebara UK Unlimited Data Pay As You Go SIM Card, Unlimited UK Minutes & Texts, 100 International minutes for £25

Lebara SIM Card, Unlimted Data SIM for £12.50, Half Price for First 3 Months, No Contract, UK Calls, UK Texts and International Calls Included, Multi-size, Fits All Devices

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Why We Love It

Huge savings for three months.
Convenient pre-loaded plan available.
Flexibility to change anytime.

Main Highlights

Register to activate your promotion.
Plan is Pre-loaded and ready to use.
30-day rolling plan. No contract. Change or cancel anytime.
Keep your existing number.
EU and India roaming included.

EE PAYG £10 Data Sim Includes £10 pre-paid credit, 8GB Data, 500 Minutes and Unlimited Texts (EE £10-20GB)

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Why We Love It

Generous data and call allowances.
Attractive bonus on multiple purchases.
Fast 4G cellular technology.

Main Highlights

20GB Data included, lasts up to 30 days
The packaging you receive may differ from the image displayed but the data you receive will be as detailed above
Roaming is not included
Free Boost - Buy 2 packs and get 2GB free
500 minutes and unlimited texts

THREE 4G/5G SIM Card UK & ROAM FREE in over 70 destinations - PREPAID PAYG £10 Bundle - 20GB + (20GB FREE DATA) Unltd Texts & Mins - ROAMING ALLOWANCE 6GB

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Why We Love It

Generous data bundle with auto-renew.
Global roaming in 70 destinations.
Fastest 5G network in UK.

Main Highlights

Quick & Easy Sim Activation - FREE 20GB PROMO – total 40GB
Bundle lasts 30 days from activation. NOTE: CREDIT WILL BE ZERO - allocated to bundle allowance
Travelling abroad - GO ROAM in over 70 destinations (includes EUROPE) - ROAMING ALLOWANCE 6GB, calls and texts to UK numbers only
UK’s fastest 5G network -Trio SIM fits any unlocked 4G and 5G device. Personal hotspot/tethering allowed
INTERNATIONAL CALLING SERVICE TO USE WITH SIM - E.g. USA - 0.3p/min and EU - 0.3p/min (optional extra)

Vodafone SIM Card UK PREPAID PAYG £10 Bundle -7GB + (14GB FREE DATA every month for 3 months with regular top ups (Promotion request deadline of 19.01.2026) - Love2surf RETAIL PACK

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Why We Love It

Prepaid bundle provides monthly flexibility.
Fits any unlocked phone easily.
Allows affordable international calling.

Main Highlights

QUICK & EASY SIM ACTIVATION - FREE 14GB PROMO activate by 19 JAN 2026 – total 21GB
The sim pack you receive will state 7GB on the printed packaging. This will be upgraded to 21GB ‘Extra Data’ promotional offer after activation on our website
BUNDLE DOES NOT INCLUDE EUROPEAN ROAMING
Trio SIM fits any unlocked 4G and above phone or devices locked to Vodafone network. Personal hotspot/tethering allowed
INTERNATIONAL CALLING SERVICE TO USE WITH SIM - E.g. USA - 0.3p/min and EU - 0.3p/min (optional extra)

EE Pay As You Go SIM Card UK PREPAID PAYG £10 Bundle 8GB + (12GB FREE DATA every month for 6 months with regular top ups (Promotion request deadline of 07.10.2025)

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Why We Love It

Free 12GB data promo.
Trio SIM fits any device.
4G speeds and WiFi calling.

Main Highlights

Quick & Easy Sim Activation - FREE 12GB PROMO activate by 07 OCT 2025 – total 20GB
The sim pack you receive will state 8GB on the printed packaging. This will be upgraded to 20GB ‘Extra Data’ promotional offer after activation on our website
Bundle lasts 30 days from activation -BUNDLE DOES NOT INCLUDE EUROPEAN ROAMING. Trio SIM fits any unlocked 4G and above phone or devices locked to EE network. Personal hotspot/tethering allowed
4G speeds up to 25Mbps (No 5G with PAYG). WIFI CALLING + WIFI COVERAGE ON LONDON UNDERGROUND + 150,000 LOCATIONS ACROSS UK
To view EE’s pay as you go pre-service information, visit ee.co.uk/paygservice. Please read before placing your order. You can download or save the document from your browser

O2 SIM Card UK & EUROPE (ROAM FREE) PREPAID PAYG £10 Bundle -8GB + Unltd Texts & Mins - ROAMING ALLOWANCE 8GB + International Calling Option - (Love2surf RETAIL PACK)

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Why We Love It

Convenient prepaid bundle.
Roaming within EU zone.
Affordable international calls.

Main Highlights

QUICK & EASY SIM ACTIVATION - 8GB
Bundle lasts 30 days from activation. NOTE: CREDIT WILL BE ZERO - allocated to bundle allowance (see description)
MUST USE SIM IN UK PRIOR TO USE IN EUROPE – data is limited to 25GB while roaming (calls & texts allowance is for UK numbers only)
Trio SIM fits any unlocked 2G and above phone or devices locked to O2 network. Personal hotspot/tethering allowed
INTERNATIONAL CALLING SERVICE TO USE WITH SIM - E.g. USA - 0.3p/min and EU - 0.3p/min (optional extra)

Vodafone Pay As You Go Sim Card

32% Off

Why We Love It

Makes switching to Vodafone easy.
Revives old phones effortlessly.
Perfect for UK visits.

Main Highlights

Suitable if your switching to the Vodafone network
Reactivate an old phone with this Sim Card
Visit the UK with your handset
Connect your existing phone to a wide range of Vodafone products and services
New SIM with mobile phone number

Lebara SIM Card: 25GB for £5, Half Price for First 3 Months, No Contract, UK Calls, UK Texts and International Calls Included, Multi-size, Fits All Devices

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Why We Love It

50% Off for three months.
Pre-loaded plan for convenience.
No contract, change anytime easily.

Main Highlights

Register to activate your promotion.
Plan is Pre-loaded and ready to use.
30-day rolling plan. No contract. Change or cancel anytime.
Keep your existing number.
Roam like home in the EU and India.

8.7

Excellent

We scanned 1770 products

We reviewed these offers relevant to the Sim Card within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Sims4Travel, Lebara, EE, love 2 surf, Vodafone, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Sim Card in the market, we considered we took a deep dive into 8851 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is O2 Data Sim Card Preloaded with UNLIMITED 4G/5G Data. Includes 25GB to Roam for Free in 47 Countries. No Contracts, No Commitments, No Credit Checks, No Tie-ins, No Personal ID. (Valid for 1 Month).. We love many things about this product by Sims4Travel. What sets it apart from the competition is Unlimited 4G/5G data preloaded, No contracts or commitments, Supports free international roaming.
The best value product for most shoppers and where user satisfaction is continuously the highest is Lebara UK Unlimited Data Pay As You Go SIM Card, Unlimited UK Minutes & Texts, 100 International minutes for £25 by Lebara based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Sim Card and the best cost-to-value ratio is Vodafone Pay As You Go Sim Cardat Vodafone with a 32% discount.
Our list of the best Sim Card is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best Sim Card in The UK

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We scanned 1770 products

We concluded that: