10 Best Esim O2 in The UK

Last updated on 03/05/2025

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Best Choice

9.8

Exceptional

SimOnly Club

Instant UK, EUROPE, and USA eSIM Connectivity Anywhere you go | 12 Month Validy, No-Contract, O2 Network Coverage

Why We Love It

Unlimited 5G data access.
No contracts or hidden fees.
Immediate connectivity upon activation.

Main Highlights

UNLIMITED DATA: Enjoy unrestricted 5G data access across the UK with comprehensive O2 network coverage reaching 99% of the population
NO CONTRACT REQUIRED: £20 pay-as-you-go SIM with no lengthy commitments or hidden charges - perfect for flexible mobile connectivity
NETWORK FLEXIBILITY: Easy network switching capability ensures you stay connected wherever you travel within the coverage area
INSTANT ACTIVATION: Quick and simple setup process gets you connected immediately upon receiving your SIM card
EXTENDED VALIDITY: 12-month validity period provides long-term reliable service without the need for frequent renewals

SimCorner Europe & UK Travel eSim Card - 30GB Data, Calls within UK & EU For 30 Days. Use In 50 Countries. Includes 25€ credit for calls. International Travel eSIM Card For Mobile Phones

Why We Love It

Stay connected across Europe effortlessly.
No restrictions on online access.
Easy activation and setup process.

Main Highlights

Stay Connected in Europe & UK: Enjoy uninterrupted data & calls with our Europe Data eSIM. Get 30GB of fast data with no daily limits and unlimited SMS & Calls to EU & UK numbers for your 30 day trip. Perfect for international travellers to over 50 European Countries
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 eSIM works with mobile phones featuring eSIM support. It includes a French phone number, you can make unlimited calls and messages to local landline and mobile numbers within the UK & EU

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

Effortless Multi-Network Coverage: Enjoy uninterrupted service with automatic switching between O2, Vodafone, EE, and Three. Always stay connected with the strongest network signal across the UK.
Dual SIM Functionality: Ideal as a secondary data SIM for iPhone or Android smartphones. Ensure your device supports eSIM technology before purchase.
Single Use: This eSIM is non-transferable between devices once downloaded.
Plug & Play Simplicity: Easy setup with a quick scan of the physical QR code. Activate your eSIM and start using it immediately—no complex procedures required.
Flexible Data Plans: Select from a variety of UK, EU, and USA data plans tailored to your needs. Whether you're a casual user or a heavy streamer, easily top up online whenever more data is needed.
MyGraspLet Account: Manage your eSIM effortlessly through the MyGraspLet portal. Monitor data usage, top up, and explore additional plans from one convenient location.
Wide Device Compatibility: Compatible with a broad range of eSIM-enabled devices, including smartphones, tablets, laptops, routers, and smart home devices.
High-Speed Performance: Experience fast internet with support for 2G, 3G, 4G, and 5G networks. Stream, browse, and work online seamlessly.
Dedicated Customer Support: Our responsive support team is available via email or through your MyGraspLet account at support@grasplet.com, ready to assist you with any inquiries.
UK Data Only: This eSIM is preloaded with data for use within the UK, excluding roaming, calls, and texts—ideal for those needing reliable data without additional features.

O2 Big Bundle 10 tariff SIM Card, BB10 Model, LTE Technology

67% Off

Why We Love It

Flexible pay-as-you-go option.
Enjoy O2 Wifi hotspot access.
No long-lasting contract obligation.

Main Highlights

O2 Bundles Pay As You Go SIM card
Exchange your £10 monthly top up for the bundle of data, minutes and texts
O2 Wifi hotspot Access
O2 Priority Access after Topup
No Contract only top-up when required to activate the bundle for 30 days or use standard rates

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.

O2 Pay As You go sim card, BIG BUNDLE 15 tariff - sims can be used with any O2 tariff

Free Shipping

Why We Love It

Flexible Pay As You Go plan.
Generous allowances for communication.
Access to free O2 WiFi.

Main Highlights

PAY AS YOU GO sim card
Exchange your £15 monthly top up for the following benefits:
750 ANY UK NETWORK MINUTES
2000 TEXTS
2GB DATA + Free O2 WiFi Hotspots

O2 SIM Card UK & EUROPE (ROAM FREE) PREPAID PAYG £15 Bundle -25GB + Unltd Texts & Mins - ROAMING ALLOWANCE 25GB + International Calling Option - (Love2surf RETAIL PACK)

Free Shipping

Why We Love It

Flexible with any unlocked phone.
Allows cheap international calls.
Includes generous data allowance.

Main Highlights

QUICK & EASY SIM ACTIVATION - 25GB
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)

Easy QR code installation.
Unlimited data at affordable price.
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 15GB, service continues at a throttled speed of 128kbps- the service 30 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

O2 SIM Card - UK & Europe Roam Free | Prepaid Pay G £15 Bundle | 25GB Free Data | Unlimited Texts & Mins + International Calling | High-Speed Data

Free Shipping

Why We Love It

Flexible plans for everyone.
No credit, easy activation.
EU roaming data included.

Main Highlights

Flexible Data Plans: Choose from 8GB for £10, 25GB for £15, 40GB for £20, or 125GB for £30. All plans include unlimited minutes and texts.
£0 Credit SIM: The SIM comes with no preloaded credit. Simply top up the exact amount of your chosen bundle, and it will activate automatically.
EU Roaming: Enjoy up to 25GB of data for free while traveling in the EU, keeping you connected wherever you go.
International Calls: Selected tariffs include international minutes to 42 countries, perfect for staying in touch globally.
Reliable Connectivity: Backed by O2’s trusted network for seamless service at home or abroad.
Visit the official O2 website for details on roaming policies and tariff plans.

🛜 Japan eSIM Card with 10GB 5G/4G/LTE Data Valid for 20 Days. Hotspot / Tethering / Internet Sharing allowed
⚡ eSIM WITHIN 24 HOURS: QR code is generated 24 hours after shipping begins and sent to your Amazon-registered email—no need to wait for package delivery. You can also retrieve it by visiting tsim.mobi/get-qr-code and entering your order ID. This URL is included in the package. Simply scan the QR code or, on iPhone, tap the link to install your eSIM and start using it immediately.
🔓 Must use unlocked phone with eSIM capability. Generally iPhone 12 and Android 2021 onwards are compatible
❌ No phone calls / SMS / refills. Apps such as WhatsApp work perfectly.
🎧 Instachat support 24x6 from seller www.tsim.mobi/chat

8.7

Excellent

Save 12%

We scanned 1881 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 SimOnly Club, SimCorner, GraspLet, O2, TSIM, love 2 surf, HAPPY TELECOM, Generic, 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 9406 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 Instant UK, EUROPE, and USA eSIM Connectivity Anywhere you go | 12 Month Validy, No-Contract, O2 Network Coverage. We love many things about this product by SimOnly Club. What sets it apart from the competition is Unlimited 5G data access. , No contracts or hidden fees. , Immediate connectivity upon activation. .
The best value product for most shoppers and where user satisfaction is continuously the highest is SimCorner Europe & UK Travel eSim Card - 30GB Data, Calls within UK & EU For 30 Days. Use In 50 Countries. Includes 25€ credit for calls. International Travel eSIM Card For Mobile Phones by SimCorner based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Esim O2 and the best cost-to-value ratio is O2 Big Bundle 10 tariff SIM Card, BB10 Model, LTE Technologyat O2 with a 67% discount.
Our list of the best Esim O2 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 Esim O2 in The UK

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We scanned 1881 products

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