10 Best Sim Only Deals Unlimited Data in The UK

Last updated on 21/06/2025

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Three Unlimited Data SIM – Uncapped 5G Speeds – Preloaded EVERY MONTH Until 8th JULY 2027 – No Contract – Plug & Play for Business Broadband, Routers & Phones

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Why We Love It

Unlimited data until 2027.
Effortless 4G and 5G connectivity.
No contracts or recurring fees.

Main Highlights

PRELOADED DATA - Unlimited Data renewed monthly until 8th July 2027 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 customer support, ready to assist you whenever needed.
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 - 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 support@scancom.co.uk
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.

Three 50GB Data SIM – Uncapped 5G Speeds – Preloaded EVERY MONTH Until 8th JUNE 2027 – No Contract – Plug & Play for Business Broadband, Routers & Phones

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Why We Love It

50GB data monthly preloaded.
Effortless plug and play.
Zero contracts or fees.

Main Highlights

PRELOADED DATA - 50GB Data renewed monthly until 8th June 2027 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.
ZERO 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 - 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.
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.

Vodafone 5G Unlimited Preloaded Data Sim. Perfect for unlocked Phones, Routers, Tablets, and Wifi Dongles - Activate anytime when you receive the SIM - Choose your Data Duration (3 Months)

Why We Love It

Effortless activation with QR code.
Wide device compatibility ensures connectivity.
Consistent connectivity with renewal options.

Main Highlights

ANYTIME ACTIVATION - Activate your Sim by scanning the supplied QR Code and enjoy 3 months of 4G & 5G data. We will activate your sim within 1 business day.
DATA RENEWAL OPTION - Extend your data usage beyond the initial term with the option to renew at the end, ensuring continuous connectivity without interruption.
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 CUSTOMER SUPPORT - For any connection queries, our customer support team at Scancom is ready to assist you. Please contact support@scancom.co.uk.
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. This Sim card does not support calls, texts, or roaming.
*Breach of fair usage policy: Data usage where users regularly tether to 12 or more devices or have used 600GB of data twice within a 6-month period. This includes fraudulent, abusive, illegal, nuisance, or outside normal commercial practice usage.

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

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Why We Love It

500GB monthly data renewal.
Effortless plug & play.
Zero contracts or fees.

Main Highlights

PRELOADED DATA - 500GB Data renewed monthly until 8th OCTOBER 2025 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.
ZERO 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 - 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.
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.

SimRush EE Unlimited Data SIM Card Preloaded for 30 Days. Prepaid, not Pay as You go or a Contract. Comes with Unlimited Data. All on the UK's biggest 5G and 4G Network.

Why We Love It

Unlimited data for versatility.
Preloaded, stress-free operation.
Uncapped speedy downloads.

Main Highlights

Unlimited Data in the UK. Perfect for your mobile phone, iPad or a mobile office. The SIM is compatible with any unlocked phone or mobile travel router with a SIM card slot, including in a 4g router or 5g modem.
No Stress! Preloaded for 30 days of use, not Pay As You Go. No Hidden Charges & No Contract. Optional Renewal Available. Activated 48hrs after SIM despatch.
Uncapped Download Speeds on The UK's biggest Network. Perfect for a Portable Wifi device, 4 & 5G hotspot, the 5GEE router, as well an unlocked cell, smartphone or any other cellular or mobile hotspot device.
Packaged for all sizes free of charge: This SIM is suitable for Standard, Micro, Nano sizes, no need for a SIM card adapter

EE Pay As You Go SIM Card UK PREPAID PAYG £20 Bundle 50GB + (100GB 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 50GB extra data.
High-speed 4G internet.
WiFi calling included.

Main Highlights

Quick & Easy Sim Activation - FREE 100GB PROMO activate by 07 OCT 2025 – total 150GB
The sim pack you receive will state 50GB on the printed packaging. This will be upgraded to 150GB ‘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

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

EE Unlimited Data SIM – Uncapped 5G Speeds – Preloaded for 1 Month from Order – No Contract & Ideal for Short-term Mobile Broadband, Routers & Phones

20% Off

Why We Love It

Unlimited Data for 1 month.
Effortless plug and play setup.
Dedicated support for your business.

Main Highlights

PRELOADED DATA - Unlimited Data for 1 month 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.

SMARTY Unlimited Data only SIM. 1 month plan, No contract, EU Roaming

56% OffFree Shipping

Why We Love It

Unlimited data for £20/month.
EU roaming included.
No speed caps.

Main Highlights

Unlimited data-only SIM for just £20 a month.
You’re free to leave at the end of the month: Commitment-free with no long contract.
No annual price rises: You won’t be shocked with a higher bill at the end of the month.
EU roaming up to 12GB included: Enjoy your EU travels without being hit with extra charges.
Switch effortlessly: Keep your existing number, no need to remember a new one.
No credit check: No hassle.
SIM fits any unlocked 4G or 5G device, not compatible with 3G devices.
How to activate this SIM: Head on over to smarty.co.uk/activate, choose the plan you want and pay on activation. Auto-renew set up for ease, you can pause, change, or cancel the plan on your dashboard.

EE 150GB Data Sim includes £20 pre-paid credit, 150GB Data, Unlimited Minutes & Unlimited Texts

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Why We Love It

Generous 50GB data allotment.
500MB free on extra packs.
Unlimited calls and texts.

Main Highlights

150GB Data Included, lasts up to 30 days
The sim you receive may be in old style packaging but will include the data allowances as per the description
Roaming is not included
Free Boost - Buy 2 packs and get 2GB free
Unlimited calls and texts
Allowances last up to 30 days from activation
If the purchased pre-paid credit is not immediately available when the sim is put into the device, please message us and include the mobile number as detailed on the back of the packaging.
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.

8.8

Excellent

We scanned 904 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, SimRush, love 2 surf, OneCall, SMARTY, EE, 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 4521 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 JULY 2027 – 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 2027. , Effortless 4G and 5G connectivity. , No contracts or recurring fees. .
The best value product for most shoppers and where user satisfaction is continuously the highest is Three 50GB Data SIM – Uncapped 5G Speeds – Preloaded EVERY MONTH Until 8th JUNE 2027 – No Contract – Plug & Play for Business Broadband, Routers & Phones 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 SMARTY Unlimited Data only SIM. 1 month plan, No contract, EU Roamingat SMARTY with a 56% 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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We scanned 904 products

We concluded that: