10 Best Sim Only Deals Unlimited Data in The UK

Last updated on 14/08/2025

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Three Unlimited Data Sim – Uncapped 5G Speeds – Preloaded EVERY MONTH Until 8th JANUARY 2026 – No Contract – Plug & Play for Business Broadband, Routers & Phones

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Why We Love It

Unlimited data until 2026.
Effortless plug and play setup.
Compatible with various devices.

Main Highlights

PRELOADED DATA - Unlimited Data renewed monthly until 8th January 2026 for a one-off payment.
EFFORTLESS PLUG & PLAY – Enjoy seamless 4G and 5G connectivity with no initial setup required.
THE UK’S FASTEST 5G NETWORK – Stream, play, watch, work & explore with the power of 5G.
UNIVERSAL DEVICE COMPATIBILITY - Optimised for Smartphones, Tablets, Laptops, Mobile Wi-Fi Dongles, Routers, IoT Devices, Smart Meters, Vehicles, Drones, GPS Trackers, Smart Home Devices & Security Cameras.
DEDICATED SUPPORT - Gain peace of mind with our dedicated business customer support, ready to assist you whenever needed. Please reach us at support@scancom.co.uk with the sim number and order reference.
VERSATILE TRIPLE CUT SIM - Our all-in-one sim card fits any Standard, Micro, and Nano size device.
EXCLUSIVE UK DATA-ONLY - This Sim card does not support calls, texts, or roaming. There is a fair use policy of 1000GB per month.
Sims cannot be ported/transferred, promotions are non-renewable, and support for pre-registered sims is available exclusively via email.
This item is tailored for business customers. If your order is not in the name of company / non-profit registered at companies house or an Amazon business customer, by purchasing, you affirm your status as a self-employed individual.

EE Unlimited Data SIM – Uncapped 5G Speeds – Preloaded for 2 Months from Order – Ideal for Mobile Broadband, Routers & Phones - Works out to £24.99 per month

Why We Love It

Unlimited Data for 2 months.
Seamless 4G & 5G connectivity.
No initial setup required.

Main Highlights

PRELOADED DATA - Unlimited Data for 2 months for a one-off payment.
EFFORTLESS PLUG & PLAY - Experience seamless 4G & 5G connectivity, no initial setup is required.
UNMATCHED EE NETWORK RELIABILITY - Depend on the UK's leading network for consistent business connectivity.
UNIVERSAL DEVICE COMPATIBILITY - Optimised for Smartphones, Tablets, Laptops, Mobile Wi-Fi Dongles, Routers, IoT Devices, Smart Meters, Vehicles, GPS Trackers, Smart Home Devices & Security Cameras.
DEDICATED SUPPORT - Gain peace of mind with our dedicated business customer support, ready to assist you whenever needed. Please reach us at support@scancom.co.uk with the sim number and order reference.
NO CONTRACTS - Benefit from our data services without the burden of contracts or recurring fees.
VERSATILE TRIPLE CUT SIM - Our all-in-one sim card fits any Standard, Micro, and Nano size device.
EXCLUSIVE UK DATA-ONLY - Tailored for data usage with a 600GB/month fair use UK-only data allowance; EE reserve the right to suspend the sim if the allowance is exceeded. This Sim card does not support calls, texts, or roaming.
This item is tailored for business customers. If your order is not in the name of company / non profit registered at companies house or an Amazon business customer , by purchasing, you affirm your status as a self-employed individual and consent to being listed as a business customer with Scancom Distribution Ltd, a necessary step to complete your purchase.
Sims cannot be ported/transferred, promotions are non-renewable, and support for pre-registered sims is available exclusively via email. Please reach us at support@scancom.co.uk with the sim number and Amazon order reference.

Vodafone Unlimited Data SIM – Uncapped 5G Speeds – Preloaded for 1 Month from Order – Plug & Play Data for Mobile Broadband, Routers & Phones

Why We Love It

Unlimited 5G data access.
Effortless plug and play.
Compatible with multiple devices.

Main Highlights

PRELOADED DATA - Unlimited 5G Data for 1 month for a one-off payment.
EFFORTLESS PLUG & PLAY - Experience seamless 4G & 5G connectivity, no initial setup is required.
UNMATCHED VODAFONE NETWORK CONNECTIVITY- Depend on the UK's best network for consistent 5G connectivity.
UNIVERSAL DEVICE COMPATIBILITY - Optimised for Smartphones, Tablets, Laptops, Mobile Wi-Fi Dongles, Routers, IoT Devices, Smart Meters, Vehicles, GPS Trackers, Smart Home Devices & Security Cameras.
DEDICATED SUPPORT - Gain peace of mind with our dedicated business customer support, ready to assist you whenever needed. Please reach us at support@scancom.co.uk with the sim number and order reference.
NO CONTRACTS - Benefit from our data services without the burden of contracts or recurring fees.
VERSATILE TRIPLE CUT SIM - Our all-in-one sim card fits any Standard, Micro, and Nano size device.
EXCLUSIVE UK DATA-ONLY - Tailored for data usage with a 600GB/month fair use UK-only data allowance; EE reserve the right to suspend the sim if the allowance is exceeded. This Sim card does not support calls, texts, or roaming.
Sims cannot be ported/transferred, promotions are non-renewable, and support for pre-registered sims is available exclusively via email. Please reach us at support@scancom.co.uk with the sim number and Amazon order reference.

EE PAYG MBB 120GB 12 Months SIM (EE PAYG MBB 120GB 12 Months SIM)

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Why We Love It

Generous 120GB data upon activation.
Zero contracts attached.
Comes in all SIM sizes.

Main Highlights

120GB of Data Included
Lasts up to 12 months from activation
No contract, no commitment. You can top-up to buy more data
The EE PAYG 120GB data SIM is compatible with the all unlocked devices or those that are locked to the EE network
SIM Card - Standard, Micro, and Nano SIM all-in-one with 120GB of data

Three Mobile Pay As You Go Mobile Broadband 24 GB data SIM

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Why We Love It

24GB data lasting 24 months.
5G access at no cost.
Compatible with any unlocked device.

Main Highlights

Pre-loaded with 24GB of data that lasts up to 24 months.
Access to our 5G network – at no extra cost.
Use data in 71 destinations – up to 12GB
SIM fits any unlocked 3G, 4G and 5G device.

Three by Three Mobile Data Pay As You Go SIM, Unlimited

6% Off

Why We Love It

Offers unlimited data, texts, minutes.
Ensures connectivity during travels.
Compatible with any unlocked phone.

Main Highlights

Included components: SIM Card. Wireless communication technology: Cellular.

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

O2 Data Sim Card Preloaded with UNLIMITED 4G/5G Data. 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 high-speed data access.
No contracts or commitments.
Supports all devices seamlessly.

Main Highlights

O2 Data Sim Card Preloaded with UNLIMITED 4G/5G Data. No Contracts, No Commitments, No Credit Checks, No Tie-ins, No Personal ID. (Valid for 1 Month)
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.
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 and more. 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 Data SIM provides amazing performance without any speed restrictions.

OneCall O2 Prepaid 30 Day Unlimited Data SIM - 4G/5G, 25GB EU Roaming

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Why We Love It

Unlimited calls, texts, data.
Hassle-free prepaid option.
No commitments or contracts.

Main Highlights

Pre-loaded O2 Sim card with unlimited 4g/5g Data for use in the United Kingdom. Fast 4g/5g Speeds with No Restrictions.
Includes 25gb of Data which can be used to Roam Free at no extra cost in the European Union
Sim will work in any compatible devices, Routers, Tablets, iPads, Dongles, Laptops, Mobile Phones, CCTV and Alarm Systems
SIM card is packaged for all sizes: Nano, Micro and standard SIM card size
No Contracts, No Commitments, No Credit Checks
SIM cards cannot be activated on weekends or bank holidays. Activation only takes place Monday - Friday

Three Mobile PAYG Voice SIM Pack - Unlimited - £35

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Why We Love It

Unlimited data, calls, and texts.
Access to fast 5G network.
Global coverage in 71 destinations.

Main Highlights

Pre-loaded with Unlimited data, unlimited minutes and texts.
Access to our 5G network.
Call, text and use data in 71 destinations – up to 30GB.
Data Pack lasts one month.
SIM fits any unlocked 4G and 5G device.

8.8

Excellent

We scanned 967 products

We reviewed these offers relevant to the Sim Only Deals Unlimited Data 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 Scancom, EE, 3, 3 MOBILE, Sims4Travel, OneCall, 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 Only Deals Unlimited Data in the market, we considered we took a deep dive into 4836 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 Three Unlimited Data Sim – Uncapped 5G Speeds – Preloaded EVERY MONTH Until 8th JANUARY 2026 – No Contract – Plug & Play for Business Broadband, Routers & Phones. We love many things about this product by Scancom. What sets it apart from the competition is Unlimited data until 2026. , Effortless plug and play setup. , Compatible with various devices. .
The best value product for most shoppers and where user satisfaction is continuously the highest is EE Unlimited Data SIM – Uncapped 5G Speeds – Preloaded for 2 Months from Order – Ideal for Mobile Broadband, Routers & Phones - Works out to £24.99 per month by Scancom based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Sim Only Deals Unlimited Data and the best cost-to-value ratio is Three by Three Mobile Data Pay As You Go SIM, Unlimitedat 3 MOBILE with a 6% discount.
Our list of the best Sim Only Deals Unlimited Data 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 Only Deals Unlimited Data in The UK

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Three 500GB Data SIM – Uncapped 5G Speeds – Preloaded EVERY MONTH Until 8th OCTOBER 2025 – No Contract – Plug & Play for Business Broadband, Routers & Phones

Vodafone Sim Card £40 Unlimited Data, texts and calls

We scanned 967 products

We concluded that: