Choose where you're going and a data plan that fits your trip. Install your eSIM over Wi-Fi and follow the plan's setup instructions.
Get mobile data abroad with Cellesim. Choose your destination, check device compatibility and find a prepaid eSIM for your trip.
An eSIM is a digital SIM that connects a compatible device to a mobile network. A travel eSIM adds a data plan without replacing your physical SIM.
eSIM plans and pricesCheck your exact device model and country version. It must support eSIM and be unlocked for other networks.
How can I check if my phone is compatible?Check your phone, choose a data plan, and get ready for your trip.
What your eSIM covers
Use maps, messaging, and other internet apps. Data-only plans don't include a phone number for standard calls or SMS.
You can keep using WhatsApp with your usual number over the eSIM's data connection. You don't need to register a new number.
Need internet on your laptop or tablet? Check if your plan and phone allow you to share your connection with a hotspot.
Before you travel
Before buying, check that your exact phone model and regional version support eSIM and that your phone is not locked to a carrier.
Use a reliable Wi-Fi connection to install your eSIM. Check your plan's details, as installing the eSIM and starting the plan can be separate steps.
If you need help with setup or your connection, contact Cellesim support with your order details.
Find answers about setting up your eSIM, using mobile data, and staying connected abroad.
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Read more, O2 Roaming Zones and Charges for GB Travelers in 2026
Planning a winter trip from the UK to the USA as an O2 customer? This guide compares O2's international roaming options with the flexibility and potential savings of using a travel eSIM for your data needs.
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Read more, BMW Berlin Marathon 2026: Essential Race-Day Data for International RunnersLearn about phone compatibility, setup, and plan details before your trip.
An eSIM is a digital SIM that you install on your phone. It lets you connect to a mobile network without needing a physical SIM card.
Check your exact model and regional version on our device compatibility page. Your phone must support eSIM and be unlocked for use with other carriers.
Follow the setup instructions in your order email to install the eSIM over a reliable internet connection. When you're ready to use it, select the eSIM for mobile data and follow the plan's instructions for activation and data roaming. Installing the eSIM doesn't always start the plan.
Yes, on a dual-SIM phone you can keep your usual line active and use the travel eSIM for mobile data. To avoid unexpected charges, check your home provider's rates for calls and texts, and turn off data switching to your home SIM.
A data-only plan gives you internet access but not a number for standard mobile calls or SMS. You can still use internet-based calling and messaging apps. Any calls or texts on your usual line will be charged by your home provider.
Check the options for your eSIM in your Cellesim account or app. If a top-up is available, review how much data it includes, how long it lasts, and how to activate it before you buy. Otherwise, you may need to buy a new plan.
Your connection depends on the networks in your plan, your phone, and local conditions. Check the plan's network details, as service can be affected by buildings, remote locations, and network traffic.
The total price is shown at checkout. This eSIM plan is separate from your mobile contract at home, so using your usual SIM for anything could still result in charges from your provider.
This depends on the plan, so check its activation details before you set it up. Buying a plan, installing it, and starting it are not always the same step.
Make sure the eSIM is turned on and selected for mobile data, then follow the setup instructions from your order. If it's still not working, keep the eSIM installed and contact support with your order details. Please don't delete the eSIM to try and fix the problem.
Check the requirements for your chosen plan before you buy. Some destinations and providers may require you to verify your identity.
No, you can keep using your existing WhatsApp number with the eSIM for internet. You don't need to change your number.
Check if your plan allows hotspot sharing and if your phone supports it. If so, you can turn on your phone's personal hotspot, and other devices can share your data.
Please contact support if your eSIM doesn't work. Whether you can get a refund depends on our refund policy and your plan's status, such as if it's been activated or used. Check the policy before you buy.
Look up your phone's exact model number and where you bought it on our compatibility page. You can also check if your phone has an EID number or an “Add eSIM” option, but be sure to also check for any regional or carrier restrictions.
Read the list of covered countries on the plan's page. A single-country plan and a regional plan can cover different places, so don't assume a nearby country is included.
