10 Best Esim O2 in The UK

Last updated on 16/07/2025
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Best Choice
1
9.8
Exceptional
O2 Unlimited 5G Data SIM - Perfect for unlocked Phones, Routers, Tablets and Wifi Dongles - Activate anytime when you receive the SIM - Choose your Data Duration (6 Months)
Scancom
O2 Unlimited 5G Data SIM - Perfect for unlocked Phones, Routers, Tablets and Wifi Dongles - Activate anytime when you receive the SIM - Choose your Data Duration (6 Months)
Free Shipping
Why We Love It
  • Easy anytime activation process.
  • Renewable data for longer use.
  • Compatible with various devices.
Main Highlights
  • ANYTIME ACTIVATION - Activate your Sim by scanning the supplied QR Code and enjoy 6 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
  • 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 - 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.
9.8
Exceptional
Amazon Logo
Best Value
2
9.7
Exceptional
H2O Wireless 120-Day USA eSIM, Prepaid eSIM Card with 20GB High-Speed 4G LTE/5G Data & 5GB Mobile Hotspot, Unlimited Data, Talk & Text to 70+ Countries, US Mobile SIM Card for Cell Phones
JZN Market
H2O Wireless 120-Day USA eSIM, Prepaid eSIM Card with 20GB High-Speed 4G LTE/5G Data & 5GB Mobile Hotspot, Unlimited Data, Talk & Text to 70+ Countries, US Mobile SIM Card for Cell Phones
Free Shipping
Why We Love It
  • High-speed data for streaming.
  • Unlimited talk and text benefits.
  • Flexible prepaid plans with transparency.
Main Highlights
  • HIGH-SPEED DATA & HOTSPOT: With H2O Wireless eSIM, you can access 5G/4G LTE speeds for quick and effortless streaming, browsing, and video calls. Additionally, all of our plans include mobile hotspot capabilities to keep all your devices conveniently connected. After purchase, you will receive a postcard with instructions and a QR code linking you to our activation submission form.
  • UNLIMITED TALK & TEXT: With H2O Wireless eSIM, access an unlimited data with opportunities to renew every 30 days. Benefit from unlimited talk and text nationwide (and to 70+ countries internationally) without interruptions as long as your calls, text and data originate in the U.S.
  • FLEXIBLE PREPAID eSIM PLANS: With H2O Wireless, what you see is what you get. Enjoy a plan that suits your unique financial and coverage needs with no contracts and no hidden fees. As opposed to the tricky charges of traditional SIMs, we offer straightforward, cost-effective plans tailored to you!
  • GLOBAL CONNECTIVITY REIMAGINED: If you're residing or traveling in the US, experience easy international communication with unlimited calls and messages to over 70 countries. Our USA eSIM ensure you never skip beat even with those across the pond.
  • SEAMLESS eSIM TECHNOLOGY: Say goodbye to the hassle of dealing with physical SIM cards. eSIM technology offers enhanced protection against SIM card theft and allows you to switch providers with ease. Following purchase, a postcard will be sent to you. Simply scan the QR code that is on it, follow activation instructions, and endless connections await.
9.7
Exceptional
Amazon Logo
3
9.6
Superb
SimCorner Europe & UK Travel eSim Card - BIG 200GB Data. 30 Days. No Daily Limit. Use In 45 Countries. Data Only International Travel eSIM Card For eSim Compatible Mobile Phone, Ipads, Tablets
SimCorner
SimCorner Europe & UK Travel eSim Card - BIG 200GB Data. 30 Days. No Daily Limit. Use In 45 Countries. Data Only International Travel eSIM Card For eSim Compatible Mobile Phone, Ipads, Tablets
Free Shipping
Why We Love It
  • Stay connected across Europe.
  • Unlimited access to social media.
  • Simple and hassle-free activation.
Main Highlights
  • Stay Connected in Europe: Enjoy uninterrupted data access with our Europe & UK Data eSIM. Get a massive 200GB of fast data for your 30 day trip. Perfect for international travellers to over 45 European Countries. Note, this Sim does not work in Switzerland
  • No Online Restrictions: Access any website or social media app like Facebook, Whatsapp, Instagram, and more without limitations. No VPN needed. Use your mobile as a hotspot or tether to other devices, keeping everyone connected
  • Easy Activation: After you’ve ordered, you will receive simple step-by-step activation instructions. Our prepaid e-sim is hassle-free. This UK and Europe Travel eSIM card will automatically activate based on the Activation Date that you provide during the registration process.
  • More Data & Extended Time Available: If you need more data, buy multiple eSIMs to meet your specific data requirements. For longer trips, simply purchase additional eSIMs to stay connected beyond 30 days
  • Wide Device Compatibility: Our data-only eSIM works with mobile phones, Apple iPads, and tablets featuring eSIM support. While it doesn't include a phone number, you can make calls and send messages through popular apps
9.6
Superb
Amazon Logo
4
9.5
Superb
UK Multi-Network Data-Only eSIM | 12-Month Validity | Auto-Connects to Strongest Network: EE, Three, O2, or Vodafone | Compatible with eSIM Devices (10 GB - 12 Months)
GraspLet
UK Multi-Network Data-Only eSIM | 12-Month Validity | Auto-Connects to Strongest Network: EE, Three, O2, or Vodafone | Compatible with eSIM Devices (10 GB - 12 Months)
Why We Love It
  • Effortless network switching keeps you connected.
  • Quick setup with simple QR scan.
  • Flexible data plans to fit needs.
Main Highlights
  • ✅ DATA PLAN DETAILS: Enjoy your total data allowance over your plan duration, starting from the SIM’s first use. This is not a monthly allowance — it’s your full data package to use as needed! Need more? Top up in seconds via your MyGraspLet account.
  • ✅ UNMATCHED NETWORK COVERAGE: Say goodbye to weak signals! Our SmartSIM automatically switches between EE, Vodafone, O2 and Three, ensuring you always have the strongest network signal anywhere in the UK. No more dead zones or dropped connections!
  • ✅ WHAT’S INCLUDED: A physical eSIM QR code that can be scanned and installed in seconds on any eSIM-compatible device, giving you data access across all major UK networks — EE, Vodafone, O2, and Three. This is a data-only SIM, meaning no calls or texts — just pure, reliable internet!
  • ✅ TRANSFERABLE eSIM: Install, remove, and reuse the eSIM across any of your supported devices — it’s that simple.
  • ✅ WIDE DEVICE COMPATIBILITY: Works flawlessly with a wide range of eSIM-enabled devices — including smartphones, tablets, laptops, routers, and smart home systems.
  • ✅ MYGRASPLET ACCOUNT: Sign up and manage your SIMs easily through the MyGraspLet online portal. Add multiple SIMs, track data usage, top up in seconds, and explore a variety of UK, EU, and USA data plans — all from one simple, user-friendly platform.
  • ✅ HIGH-SPEED PERFORMANCE: Enjoy fast, dependable internet with support for 2G, 3G, 4G, and 5G networks. Stream, browse, and work online without interruptions.
  • ✅ DEDICATED CUSTOMER SUPPORT: Our UK-based support team is available 24/7, all year round. Contact us anytime via support@grasplet.com or through your MyGraspLet account for fast, reliable assistance.
9.5
Superb
Amazon Logo
5
9.3
Superb
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).
Sims4Travel
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).
Free Shipping
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
9.3
Superb
Amazon Logo
6
9.1
Superb
Wave Connect Quad Network Data Only SIM, Three, EE, O2, Vodafone, 4G LTE + 5G Prepaid, Activates On First Use, Includes UK, Ireland, EU, For Unlocked IoT Devices, Security Cameras (6GB | 12 Months)
Wave Connect
Wave Connect Quad Network Data Only SIM, Three, EE, O2, Vodafone, 4G LTE + 5G Prepaid, Activates On First Use, Includes UK, Ireland, EU, For Unlocked IoT Devices, Security Cameras (6GB | 12 Months)
Free Shipping
Why We Love It
  • Flexible SIM card sizes available.
  • Easy online registration process.
  • Automatic top-ups for convenience.
Main Highlights
  • THE PLAN: 6GB to use anytime within 365 days months (not 6GB per month). Refill any time to reset the duration.
  • WHAT’S INCLUDED: A 3-in-1 SIM card with data to use across all major UK networks. The card includes standard/micro/nano sizes. This is data-only, no voice or text.
  • HOW IT WORKS: Insert to use straight away, register online to view data use and top-up.
  • WHY THIS SIM? Enjoy online access to view data consumption, add alerts and notifications when nearing your data allowance, and top-up manually or choose automatic top-ups with different data allowances available.
  • WHO’S THIS FOR? This non-steered SIM card connects to all networks so is great for trail cameras, CCTV, surveillance, security, movement cameras, solar energy monitoring systems and wind turbines - although it will work with most devices.
  • TOP-UP ANYTIME: A choice of options to add more data based on your use. Downgrade or upgrade at any time. Select automatic refill to ensure you’re always connected.
  • PLUS, EXTRA: 5G coverage and 10-year SIM card replacement at no additional cost.
9.1
Superb
Amazon Logo
7
8.9
Excellent
Australia eSIM | 30GB Super Saver Refillable Plan! QR Code Sent via Email in 24Hrs - Scan & Use Immediately | Auto Activating 30 Day Validity | 5G Speed + Hotspot | Data-Only No Phone Number
TSIM
Australia eSIM | 30GB Super Saver Refillable Plan! QR Code Sent via Email in 24Hrs - Scan & Use Immediately | Auto Activating 30 Day Validity | 5G Speed + Hotspot | Data-Only No Phone Number
Free Shipping
Why We Love It
  • High-speed data for seamless browsing.
  • Easy refills via InstaSIM app.
  • Quick eSIM delivery within 24 hours.
Main Highlights
  • HIGH SPEED 5G/4G DATA: Enjoy up to 30GB of high-speed 5G/4G internet. Hotspot tethering is supported.
  • REFILLABLE VIA InstaSIM APP: Check usage and refill data anytime through the InstaSIM app. No need to worry about running out of data
  • GET YOUR eSIM WITHIN 24 HOURS: A QR code is generated 24 hours after shipping begins and is sent to your Amazon-registered email address—no need to wait for package delivery. You can also retrieve your QR code by visiting tsim.mobi/get-qr-code and entering your order ID. The package includes this URL as well. Simply scan the QR code or, on an iPhone, tap the link provided to install your eSIM and start using it immediately!
  • COMPATIBILITY : This is a Data-only eSIM with no phone number. It requires eSIM capable phones such as iPhone 12+ or Android 2021+.
  • 24x6 MULTILINGUAL SUPPORT: Get assistance in multiple languages via phone, email, or InstaChat (tsim.mobi/chat), Monday to Saturday. Contact details are included with the eSIM packaging.
8.9
Excellent
Amazon Logo
8
8.7
Excellent
H2O Wireless 30-Day USA eSIM, Prepaid eSIM Card with 60GB High-Speed 4G LTE/5G Data & 5GB Mobile Hotspot, Unlimited Data, Talk & Text to 70+ Countries, US Mobile SIM Card for Cell Phones
JZN Market
H2O Wireless 30-Day USA eSIM, Prepaid eSIM Card with 60GB High-Speed 4G LTE/5G Data & 5GB Mobile Hotspot, Unlimited Data, Talk & Text to 70+ Countries, US Mobile SIM Card for Cell Phones
Free Shipping
Why We Love It
  • High-speed 5G access available.
  • Unlimited talk and text freedom.
  • Flexible plans with no contracts.
Main Highlights
  • HIGH-SPEED DATA & HOTSPOT: With H2O Wireless eSIM, you can access 5G/4G LTE speeds for quick and effortless streaming, browsing, and video calls. Additionally, all of our plans include mobile hotspot capabilities to keep all your devices conveniently connected. After purchase, you will receive a postcard with instructions and a QR code linking you to our activation submission form.
  • UNLIMITED TALK & TEXT: With H2O Wireless eSIM, access an unlimited data with opportunities to renew every 30 days. Benefit from unlimited talk and text nationwide (and to 70+ countries internationally) without interruptions as long as your calls, text and data originate in the U.S.
  • FLEXIBLE PREPAID eSIM PLANS: With H2O Wireless, what you see is what you get. Enjoy a plan that suits your unique financial and coverage needs with no contracts and no hidden fees. As opposed to the tricky charges of traditional SIMs, we offer straightforward, cost-effective plans tailored to you!
  • GLOBAL CONNECTIVITY REIMAGINED: If you're residing or traveling in the US, experience easy international communication with unlimited calls and messages to over 70 countries. Our USA eSIM ensure you never skip beat even with those across the pond.
  • As a valued customer, you have the option to renew for 30, 60, or 90 days. Renewal is simple. Visit the JZN H2O Refill & Top-Up Page. Choose Your Plan. Enter your phone number. Apply the code: JZNAMAZON25. Complete your purchase and voila! Note: This is only for first time renewals and JZN activated numbers.
8.7
Excellent
Amazon Logo
9
8.7
Excellent
eSim Devices Only | Happy 5G eSim Australia & New Zealand 15Days Unlimited Data Travel eSim | 8GB of 5G High-Speed Data Then 128kbps | Support iPhone & Android Devices | No Need Registration
HAPPY TELECOM
eSim Devices Only | Happy 5G eSim Australia & New Zealand 15Days Unlimited Data Travel eSim | 8GB of 5G High-Speed Data Then 128kbps | Support iPhone & Android Devices | No Need Registration
Free Shipping
Why We Love It
  • Easy QR code installation process.
  • Unlimited data for 15 days.
  • Compatible with multiple devices.
Main Highlights
  • ▶ Please make sure your device is eSIM compatible and unlocked before you buy. If your device does not support eSIM function, please buy the physical version instead.
  • ▶ Scan QR Code, no registration is required- unlimited data service, no calls/texts- after the usage reaches 8GB, service continues at a throttled speed of 128kbps- the service 15 days starts from the date of activation.
  • ▶ You will receive an eSIM QR code in the package for your eSIM applicable smartphone & expiry date on 31-Dec-2025. Support Apple IOS, iPadOS, iPhone, iPad & Android Devices.
  • ▶ QR code can only be scanned and installed once, and the device cannot be replaced after binding. Do not delete or remove the QR code unless you have finished using it, otherwise you will not be able to rescan for installation and binding.
  • ▶ Your device must be connected to the Internet when installing eSIM, please make sure that there is WiFi or mobile data available before installation. Our one-time eSIM data plan is compatible with any network-unlocked device that supports eSIM
  • ▶ Apple iPhone / iOS eSIM installation instruction: go to “Settings” > “Cellular/Mobile” > “Add eSIM” > “Use QR Code” > “Scan QR Code” or “Open Photos for QR Code Screenshot" > Activate eSIM and “Continue” > label your eSIM and click “Continue”
  • ▶ Android smartphone eSIM installation instruction: go to “Settings” > "Connections" > "SIM Card Manager" > "Add Mobile Plan" > “Scan QR code" > “Add / Continue”
  • ▶ After installing eSIM, please ensure your original local SIM is OFF or disconnected, to avoid causing high roaming charges. Access Google, Facebook, Instagram, Youtube, Twitter & More
8.7
Excellent
Amazon Logo
10
8.7
Excellent
USA eSIM 21 Days | Call Home for Free | T-Mobile Network with Unlimited High Speed Data | Unlimited Local Calls and SMS to UK and USA (including Hawaii). Receive eSIM Same Day by Email and Start Using
TSIM
USA eSIM 21 Days | Call Home for Free | T-Mobile Network with Unlimited High Speed Data | Unlimited Local Calls and SMS to UK and USA (including Hawaii). Receive eSIM Same Day by Email and Start Using
Free Shipping
Why We Love It
  • Free calls to USA and UK.
  • Unlimited high-speed 5G data.
  • Easy eSIM activation process.
Main Highlights
  • CALL HOME FOR FREE : Unlimited calling and texting (SMS) to USA and UK phone numbers.
  • UNLIMITED HIGH SPEED DATA: Unlimited Super-Speed 5G/4G data in USA. Hotspot/Data Sharing Allowed. T-mobile Network has good reception in USA (Hawaii Included).
  • GET eSIM SAME DAY! A few hours after ordering, go to tsim.mobi/activate, enter your Amazon orderID and follow instructions to schedule immediate or later activation of eSIM. You will also receive an email with the URL and instructions if needed. The manual is also uploaded in the images.
  • COMPATIBILITY : Use a modern phone with eSIM capability to be able to utilise American networks. In general Chinese branded phones are NOT allowed on American networks. iPhones 12+ always work. Search for "t-mobile bring your own phone" or visit tsim.mobi/chat for free compatibility check.
  • SUPPORT: 24x6 (Monday-Saturday) multilingual support provided by phone, email and InstaChat. Use contact info printed on the SIM card packaging.
8.7
Excellent
Amazon Logo

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We scanned 475 products

We reviewed these offers relevant to the Esim O2 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, JZN Market, SimCorner, GraspLet, Sims4Travel, Wave Connect, TSIM, HAPPY TELECOM, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.
For the best Esim O2 in the market, we considered we took a deep dive into 2376 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: