UK eSIM Guide 2025: 30 Questions | Best eSIM for UK

1. How to buy an eSIM for the UK?

To buy a UK eSIM, visit Mobimatter’s website and select a UK travel data plan that suits your needs. Choose the data amount and validity period, complete payment, and you’ll instantly receive a QR code and manual install instructions via email and dashboard. Install it using your phone’s eSIM settings. No physical SIM, no airport queues, no ID verification. You’ll stay connected from the moment you land in the UK. The process is quick, secure, and hassle-free, ideal for tourists and business travelers who want smooth connectivity without the inconvenience of traditional SIM card shopping abroad.

2. Which is the best eSIM for the UK?

The best UK eSIM depends on your usage. Light travelers can go for 1–5 GB plans suitable for maps and messages. If you plan on streaming, attending video calls, or working remotely, choose larger data plans with 10–30+ GB. Mobimatter helps by curating top eSIM options from providers like EE, Vodafone, and O2. Each plan includes user reviews, speed, and hotspot support, making it easy to compare and pick the right one. Choose the plan that fits your travel style, and you’ll enjoy fast, reliable mobile internet throughout the UK without worrying about hidden costs or unreliable service.

3. What should I look for when comparing different travel eSIMs for the UK?

Compare these factors: data volume (1–30+ GB), validity period (3–30 days), network (EE, Vodafone, O2), speed (4G/5G), hotspot support, per-GB pricing, and refund policy. Also consider whether the plan includes customer service and what actual users are saying. If you want strong signal in urban and rural areas, check coverage quality. Mobimatter provides all these details clearly, helping you make a smart choice without research overload. For frequent travelers, focus on data value and connectivity. For casual users, short-term plans offer savings. Prioritize what matters to you—cost, coverage, speed, or convenience—and pick accordingly.

4. Do I need to provide any documents like a passport to buy a travel eSIM for the UK?

No. With Mobimatter, there’s no need to provide a passport, national ID, or any physical documentation. All that’s required is your email address to receive the QR code and installation details. This eliminates the hassle associated with buying SIM cards from physical stores that typically require ID and paperwork. The eSIM buying process is fast, secure, and 100% digital. This is especially beneficial for international travelers who don’t want to waste time at kiosks or deal with language barriers. Mobimatter’s no-paperwork approach keeps things easy, efficient, and totally private—just buy online, install, and connect instantly.

5. Can I buy an eSIM for the UK in advance or should I wait until I arrive?

Yes, you should absolutely buy your UK eSIM in advance. Mobimatter allows you to purchase and install the eSIM from anywhere in the world before your trip. You’ll receive a QR code or manual details right after purchase. Simply install it while connected to Wi-Fi, then activate it once you land in the UK. This means you skip the airport SIM chaos and get connected instantly. No lines, no stores, no roaming worries. It’s smart travel planning—especially if you rely on navigation apps, need rideshare access, or want to contact loved ones as soon as you land abroad.

6. How do I install and activate my international eSIM for the UK?

First, ensure you're connected to Wi-Fi. On iPhone, go to Settings → Cellular → Add eSIM → Scan QR. On Android, go to Settings → Network & Internet → SIM Manager → Add eSIM → Scan QR. Mobimatter also provides a manual installation method using the SM-DP+ server address and activation code. Label your plan (e.g., “UK eSIM”) so it’s easy to manage. Don't activate until you land in the UK to preserve your data plan’s validity. Activation typically takes under a minute, and you’ll be online immediately using local UK networks with 4G or 5G speed.

7. Should I activate my travel eSIM before I leave or when I arrive in the UK?

Install the eSIM before you travel, but activate it only when you arrive in the UK. Activation starts the validity timer, so turning it on early might waste days of your plan. Use your hotel’s or airport’s free Wi-Fi to activate the eSIM once you land. This way, you maximize the data period and avoid any network conflicts. Mobimatter also shares setup instructions that help you time your activation smartly. Preparing in advance is smart, but actual use should start only when you need connectivity. Following this approach ensures you get the full value of your data package.

8. How do I activate my UK eSIM using a QR code?

Activating your UK eSIM via QR code is quick. First, connect your phone to Wi-Fi. Then go to your phone’s eSIM settings. On iPhone: Settings → Cellular → Add eSIM → Scan QR Code. On Android: Settings → Network → SIM Manager → Add eSIM → Scan QR. Point your phone camera at the QR code provided by Mobimatter. Once scanned, confirm and label the plan, then enable it as your default data line. Activation usually takes less than one minute. This simple scan-and-go setup eliminates any need for a physical SIM card or visiting a telecom store abroad.

9. What if I can’t scan the QR code for my UK eSIM? Is there a manual installation method?

Yes. If your phone can’t scan the QR code or if you prefer manual setup, Mobimatter provides manual installation details, including the SM-DP+ server address and activation code. On your phone, go to eSIM settings, choose “Add eSIM manually,” and input the information exactly as shown. This method is especially helpful if you’re using a device that doesn’t support QR scanning or if you experience camera issues. Manual setup takes just a few minutes and connects you to UK networks instantly. Mobimatter also offers step-by-step instructions in your dashboard to guide you through the manual setup process.

10. How do I switch between my primary SIM and my travel eSIM on my phone in the UK?

On your phone, go to SIM Manager or Cellular Settings. You’ll see both your home SIM and UK travel eSIM listed. Set the UK eSIM as the default for mobile data. You can keep your home SIM active for calls and SMS if needed. Want to swap again? Just return to settings and toggle preferences. This flexibility is ideal for travelers needing to stay in touch with home numbers while using local data. Your phone will intelligently route data, calls, and texts based on your choices. Dual-SIM management is simple and customizable on modern smartphones that support eSIM.

11. How do I make sure I am using the UK eSIM for data and not my home plan to avoid roaming charges?

To avoid roaming charges, go to Mobile Data settings and set your UK eSIM as the default data line. Then turn off “Data Roaming” on your primary SIM to prevent accidental use. This ensures that all mobile data activities—browsing, maps, videos—are routed through the UK eSIM and not your home plan. Mobimatter also shares step-by-step instructions on doing this during setup. Double-check these settings before landing to avoid roaming surprises. With the right settings, you’ll stay connected on local UK networks at low costs, without worrying about unexpected roaming fees from your home country carrier.

12. What is a travel eSIM and how does it work for international trips to the UK?

A travel eSIM is a digital SIM card that’s embedded in your smartphone. Instead of using a physical chip, the eSIM stores your mobile plan details digitally. When you travel to the UK, you buy a travel eSIM online, install it via QR or manually, and connect to local networks like Vodafone, EE, or O2. There’s no need to buy a SIM card at the airport or verify documents. It’s seamless, fast, and remote. You can stay connected to data services right when you land—ideal for navigation, communication, and travel apps, especially for tourists or business travelers.

13. Why should I use an eSIM for UK travel instead of my home carrier’s roaming plan?

Roaming with your home carrier is often expensive, unpredictable, and slow. A UK travel eSIM offers significant savings—often 20–70% cheaper—and gives you access to fast local networks like Vodafone and EE. You avoid surprise charges, restrictive data caps, and unreliable service. eSIMs are also instant: no store visits, no documentation, just a QR code and a few taps. You can activate the plan as soon as you land. Whether you're checking maps, booking rides, or streaming, an eSIM ensures better performance, affordability, and convenience compared to international roaming with your home telecom provider.

14. Is an eSIM cheaper than international roaming when visiting the UK?

Yes, UK travel eSIMs are typically far cheaper than international roaming. Mobimatter’s eSIM plans are priced like local SIM cards, offering high-speed data without shocking post-trip bills. Roaming fees from your home carrier can include hidden charges, small data limits, and expensive overage rates. eSIMs avoid all of that. You pay upfront, know exactly what you’re getting, and enjoy local network speeds. Even short-term travelers benefit—just one day of international roaming often costs more than a week of eSIM usage. With no hidden costs or surprise fees, eSIMs are the smart, budget-friendly option for UK travel.

15. What’s the difference between a UK travel eSIM and a local physical SIM card?

A UK travel eSIM is 100% digital and can be purchased and activated online, without visiting a store. A physical SIM card requires in-person purchase, identification, and manual installation. With eSIMs, there's no need to swap hardware, no chance of losing small SIM chips, and no hassle at the airport. eSIMs also allow dual SIM functionality—keep your home SIM active while using UK data. The whole eSIM process takes minutes, not hours. It’s ideal for modern travelers who value speed, simplicity, and digital convenience. Plus, most eSIMs offer flexible plans, clear pricing, and strong network partnerships.

16. Can I use a UK eSIM and my regular SIM card at the same time?

Yes, most modern smartphones support dual SIM functionality—one physical SIM and one eSIM. You can keep your home SIM active for receiving calls or SMS while using your UK eSIM exclusively for mobile data. This is perfect for staying connected to your local contacts without roaming charges. Just go to SIM settings, assign the UK eSIM for data, and the home SIM for calls/texts if needed. Your phone will automatically manage usage based on these settings. This seamless switching makes it convenient for business travelers or tourists to stay connected in two countries at the same time.

17. Will I get a new phone number with a UK travel eSIM?

Typically, UK travel eSIMs from Mobimatter are data-only, meaning they do not provide a phone number or voice/texting services. You won’t receive a new UK phone number unless the specific plan offers voice/SMS features. However, your existing SIM card can still be used to receive calls or messages if your phone supports dual SIM. For most travelers, data is all they need—WhatsApp, iMessage, and similar apps work fine. If voice calling is essential, look for a plan with VoIP support or call over the internet using data apps. Always check plan features before purchase for clarity.

18. Can I still receive calls and texts on my original number while using a UK eSIM for data?

Yes, as long as your phone supports dual SIM functionality and your primary SIM remains active (with data roaming turned off), you can still receive calls and SMS on your original number. Assign the UK eSIM for data only, and let your home SIM handle voice. This is ideal for staying accessible to family, colleagues, or banks while traveling. Be cautious—if you enable roaming accidentally, your home carrier may charge fees for incoming calls or background data. Use airplane mode + enable SIM individually if unsure. Mobimatter’s instructions also help configure this during eSIM activation.

19. Do UK travel eSIMs include calls and SMS, or are they data-only?

Most UK travel eSIMs sold via Mobimatter are data-only, meaning they don’t support traditional voice calling or texting. However, data-based apps like WhatsApp, FaceTime Audio, Skype, or Google Meet work perfectly over the internet. Some eSIM plans may offer optional voice/SMS bundles, but these are rare. Always read the plan description carefully before purchasing to see if calling is included. For general travel purposes—maps, messaging apps, video calls, ride-sharing—a data-only eSIM is more than sufficient. If calling is crucial for your trip, choose a plan that mentions VoIP compatibility or includes native call/text capabilities.

20. How much data will I need for my trip to the UK?

Your data needs depend on usage. For light travelers who mostly use Google Maps, emails, and ride apps, 3–5 GB is usually enough. Moderate users who browse the web and social media frequently will need 10–20 GB. Heavy users—those streaming videos, working remotely, or uploading content—should consider 30 GB or more. Mobimatter offers plans in various sizes, so you can match your data volume to your lifestyle. Also, many phones let you track data usage. Review your previous trips or current mobile use to estimate. It’s better to buy slightly more than needed to avoid throttled speeds or topping up.

21. Is my phone unlocked and compatible with UK eSIMs?

To use a UK eSIM, your phone must be unlocked and eSIM-compatible. Most flagship phones released after 2020 meet both criteria. For Apple, iPhone XS/XR or newer support eSIM. For Android, Google Pixel 3+, Samsung Galaxy S20+, and models from Huawei, Oppo, and Xiaomi often qualify. To check compatibility: go to Settings → Cellular or Network → look for “Add eSIM” or “Add Mobile Plan.” Mobimatter’s checkout page also includes a compatibility checker. If your device is carrier-locked, contact your provider to unlock it before travel. Always verify before purchasing to avoid eSIM setup issues while abroad.

22. What is an eSIM card and how does it work in the UK?

An eSIM is a digital SIM card embedded in your device that lets you connect to mobile networks without a physical card. In the UK, it allows travelers to access local carriers like EE, O2, and Vodafone through Mobimatter. After purchasing, you receive a QR code or manual activation info to install the eSIM profile. Once installed and activated, your phone connects to the UK network just like a regular SIM. It’s fast, convenient, and doesn’t require any hardware swaps. Perfect for tourists, digital nomads, or business travelers who want instant connectivity the moment they land.

23. How to activate eSIM on iPhone in the UK?

To activate your eSIM on iPhone while in the UK, ensure you’re connected to Wi-Fi. Then go to Settings → Cellular → Add eSIM. Choose “Use QR Code” and scan the code from Mobimatter. Alternatively, enter the activation details manually if provided. Label the plan (e.g., “UK eSIM”) to distinguish it from your home SIM. Set it as your primary data line under “Cellular Data.” Once activated, your iPhone will automatically connect to UK mobile networks. The process is simple and takes under five minutes. If any issues arise, Mobimatter’s customer support is available for guidance during setup.

24. How to transfer eSIM from one iPhone to another iPhone in the UK?

Mobimatter makes it easy to transfer an eSIM between iPhones. First, delete the eSIM profile from your old iPhone: go to Settings → Cellular → select plan → Remove Cellular Plan. Then log in to your Mobimatter dashboard and request a new QR code for the same eSIM plan. On your new iPhone, go to Settings → Cellular → Add eSIM → scan the new QR code. Label the plan appropriately (e.g., “UK Travel”). Activate the eSIM as your default data line. The process ensures seamless data continuity while switching devices and prevents conflicts between multiple active eSIMs.

25. Which phones support eSIM in the UK?

Many modern phones support eSIM functionality in the UK. Compatible devices include Apple iPhones XS, XR, and all models from iPhone 11 to iPhone 15. Google Pixel models from Pixel 3a to Pixel 7 also support eSIM. Samsung Galaxy S20, S21, Z Fold, and Flip series offer eSIM too. Some flagship Android phones from Huawei, Oppo, and Xiaomi are also supported. To check your phone, go to Settings → Cellular or Network → Add eSIM. If visible, your device is ready. Mobimatter’s website also checks compatibility at checkout to prevent users from buying incompatible eSIM plans by mistake.

26. How to transfer eSIM from iPhone to Android in the UK?

You cannot directly transfer an eSIM between iPhone and Android due to platform restrictions. Instead, log in to your Mobimatter account and request a new QR code for your eSIM plan. On your Android device, go to Settings → Network → SIM Manager → Add eSIM → Scan QR. Alternatively, install it manually using Mobimatter’s SM-DP+ server details and activation code. Label the new plan accordingly. After setup, remove the eSIM from your iPhone to avoid conflicts. The process is quick and ensures you continue using your data plan without interruptions, even after switching device ecosystems.

27. How to delete eSIM from iPhone used in the UK?

To delete an eSIM from your iPhone, go to Settings → Cellular → Select the eSIM plan you want to remove (e.g., “UK Travel”) → Tap “Remove Cellular Plan.” Confirm the removal. This deletes the eSIM profile from your device and frees up space for future profiles. If you plan to reinstall the same plan later, ensure your provider (Mobimatter) can issue a new QR code. Always delete unused eSIMs when switching devices or after your travel period ends to avoid confusion or accidental usage. Deleting the eSIM doesn’t cancel the plan—it just removes it from your current phone.

28. How to set up eSIM on iPhone while in the UK?

To set up an eSIM while in the UK, first connect your iPhone to Wi-Fi. Then go to Settings → Cellular → Add eSIM. Choose to scan a QR code or enter details manually. Scan the QR provided by Mobimatter or input the SM-DP+ address and activation code. Label the plan for easy identification (e.g., “UK eSIM”), and choose it as your data line. Once activated, your iPhone connects to local UK networks instantly. The entire process takes just minutes. Ensure your iPhone is unlocked and compatible. If you face issues, Mobimatter provides detailed instructions and support.

29. How to add eSIM to iPhone while in the UK?

To add an eSIM to your iPhone, connect to Wi-Fi and go to Settings → Cellular → Add eSIM. Select “Use QR Code” and scan the code provided by Mobimatter. If your QR isn’t available, use the manual option and enter the SM-DP+ server and activation code. Once added, label the plan to distinguish it. You can set it as your default for data or use it alongside your home SIM. The process works the same whether adding a new or replacement eSIM. It’s fast, easy, and ensures reliable data on UK networks without needing a physical SIM card.

30. Is my phone eSIM compatible for use in the UK?

To check if your phone is compatible with eSIM in the UK, go to Settings → Cellular (or Network & Internet) → Add eSIM. If the option appears, your phone supports eSIM. Also, ensure your phone is unlocked, as carrier-locked devices may block eSIM access. Mobimatter provides a compatibility checker at checkout to confirm support. Compatible phones include iPhone XS and newer, Google Pixel 3+, and Samsung Galaxy S20+ and above. Many modern flagship Android devices also qualify. Always verify your device’s specs before buying. Without compatibility and unlock status, you won’t be able to install a UK eSIM.