Knowing how to activate roaming is what separates arriving at the airport with internet from being stuck looking at the "No service" icon. In this guide, I'll show you how to activate data roaming on iPhone and Android step-by-step, by carrier, and how to check that everything is ready before takeoff. You'll have it done in 1 minute.
What is data roaming and why activate it
Activating data roaming means allowing your mobile phone to use networks in another country for internet, calls, and SMS. Without this option turned on, your phone connects to a foreign antenna but blocks data, leaving you without maps or messaging at your destination.
Roaming (also known as "data roaming") is the function that authorizes your mobile phone to use the network of a different carrier than your own when you are outside your usual coverage area. This is exactly what happens when you land in Thailand or Mexico: your home antenna no longer reaches, so your phone connects to a local one. If the option is off, you'll see coverage but the browser won't load anything. That's why it's the first setting you should adjust when traveling outside the European Union, where "roaming like at home" doesn't apply. I explain it in depth in what is data roaming, with the general context of rates and zones. Activating it is free: what costs money is consumption, not the switch. Within the EU, it's usually included in your plan; outside, a data eSIM is advisable to avoid bill shock.
How to activate roaming on iPhone
On iPhone, go to Settings > Cellular > Data Roaming and toggle the switch on. If you have multiple lines or an eSIM, first select the correct line within "Cellular" and activate roaming for that specific line, not another one.
The complete process on iOS is quick, and most importantly, it needs to be done on the correct line. Follow these steps:
- Open Settings and go to Cellular (or "Mobile" depending on the iOS version).
- If you use two lines, tap the line you will be traveling with (your destination eSIM, for example) to configure it separately.
- Go to Cellular Data Options > Data Roaming and slide it to turn it green.
- Check that the same line is marked as the active "Cellular Data" line.
Traveler's tip: Leave your home country line for calls and SMS only, and set your travel eSIM as the data line. This way, you avoid accidentally using expensive roaming from your carrier.
If you've just installed an eSIM and don't know how to get it ready, remember that roaming is the last switch to touch: without it turned green, there will be no data, no matter how well the line is configured.
How to activate roaming on Android
On Android, open Settings > Connections (or Network & Internet) > Mobile Networks and activate "Data roaming." On phones with two SIMs, first choose the correct data SIM at the top; each card has its own independent roaming switch.
The path changes slightly depending on the brand (Samsung, Xiaomi, Google Pixel, OPPO), but the idea is always the same. Here are the most common variants in 2026:
- Samsung (One UI): Settings > Connections > Mobile networks > Data roaming.
- Xiaomi / Redmi (HyperOS): Settings > SIM cards & mobile networks > tap the SIM > Roaming.
- Google Pixel: Settings > Network & internet > SIMs > Roaming.
- OPPO / realme: Settings > Connection & sharing > SIM card & mobile data > Roaming.
If you're using a digital data card, it's ideal to have it configured before you leave. Check how to activate an eSIM to avoid leaving everything until the last minute in the boarding line. As soon as the switch is green and you connect to a local network, you'll have data.
Activating it by carrier (Movistar, Vodafone, Orange, Digi)
The setting on your phone is only half the battle: your carrier must have roaming enabled on your line. For travel within the EU, it's almost always activated by default. For destinations outside the EU, sometimes you have to request it or accept conditions, and prices without a bundle can be very high.
| Carrier | EU Roaming | Outside the EU | How to manage it |
|---|---|---|---|
| Movistar | Included in plan | Bundles by zone or pay-as-you-go | Mi Movistar App / customer service |
| Vodafone | Included in plan | Daily travel passes | Mi Vodafone App |
| Orange | Included in plan | International travel bundles | Mi Orange App |
| Digi | Included in plan | Activation upon request | Customer area / call |
For reference, outside the EU, pay-as-you-go without a bundle usually ranges from a few euros per megabyte or several euros per day, which quickly adds up; a single afternoon uploading photos can cost you more than an entire travel data bundle. Check the official carrier website for the exact rate for your plan and zone, as it varies by country. If your plan doesn't include the destination, the cheapest option is usually to disable roaming on your line and use data from a local eSIM.
How to know if it's activated
To confirm that roaming is active, go back to the menu where you activated it and check that the switch is green. At your destination, look at the status bar: many phones show an "R" or the name of the foreign network when you're connected to a roaming network.
Don't just rely on the switch: the real test is to open a website with mobile data turned on and Wi-Fi off. If it loads, you're good. There are three signs that confirm you are operating on a foreign network:
- The name of a foreign operator appears at the top (e.g., "Telcel" in Mexico or "AIS" in Thailand).
- Some phones show a small roaming icon next to the signal strength.
- In the network settings, the connection is listed as active roaming.
If you want a detailed step-by-step check, follow how to know if I have roaming activated. Doing this verification as soon as you land, still at the airport with free backup Wi-Fi, saves you the typical hassle of being without internet just when you need to order a taxi.
Why your travel eSIM needs roaming activated
A travel eSIM works, technically, by connecting to local networks in the destination country through roaming. That's why, even if the eSIM is "local," your phone needs data roaming enabled on that specific line for data to flow. This is the number one misunderstanding.
Many people install their digital card, arrive at their destination, and it doesn't work; almost always the reason is that the roaming switch for that line was off. The eSIM connects to a partner network in the country, and for your phone, that counts as a foreign network: if you don't give it permission, it blocks data. The good news is that, since you pay for a fixed data bundle, there are no surprises on your bill even if roaming is active. Activating roaming here does not make anything more expensive: it only unlocks the data you already paid for in advance. If you want to see how the entire end-to-end process fits together, we explain it in how PuraSim works, and you have country-specific plans ready to buy before you leave.
Common errors and how to avoid them
Activating roaming is simple, but there are four common mistakes that happen again and again. Knowing them will save you the classic "my internet isn't working" on the first day of your trip, just when you need it most.
- Activating roaming on the wrong line. With dual SIMs, make sure to turn on roaming for the data line you'll be using, not your home country line.
- Forgetting manual network selection. If it doesn't connect automatically, go to network selection and manually choose a local operator.
- Leaving your carrier's roaming on unintentionally. If you're using an eSIM, it's a good idea to disable data on your home line. We guide you on how to disable mobile roaming.
- Not restarting after installing the eSIM. A quick restart resolves most initial connection issues.
Tip: Set up and test everything from home with Wi-Fi before you travel. If the eSIM already shows simulated coverage or is "on standby," you'll arrive at your destination with just a flick of the switch.
Frequently asked questions
Does activating data roaming cost money?
No, the switch itself is free: you are not charged for activating it. What you pay for is data consumption on a foreign network according to your plan. With a travel eSIM, you pay for a fixed bundle in advance, so activating roaming does not add any extra cost.
Why do I have coverage but no internet abroad?
Almost always it's because data roaming is off. Your phone connects to the local antenna for calls, but blocks data until you activate the switch on the correct line. Turn it on, restart, and try opening a website with Wi-Fi disabled.
Do I need to activate roaming if I use a travel eSIM?
Yes. Even though the eSIM uses local networks at the destination, your phone considers them foreign and needs roaming enabled on that line to provide data. This is the number one reason why an eSIM "doesn't work" upon arrival. Activate it on the eSIM line, not your home line.
Does roaming consume battery or background data?
Background data consumption exists just like at home; it's not exclusive to traveling. To control it, disable automatic app updates and photo synchronization while using mobile data. Battery life is hardly affected by having roaming activated.
Is activating and deactivating roaming the same?
No, they are opposite actions. Activating it gives you internet abroad; deactivating it blocks it to avoid unexpected charges from your carrier. If you travel with an eSIM, it's common to disable roaming on your home line and activate it on the eSIM.
Conclusion
Activating data roaming is a 1-minute switch, but it determines whether you arrive connected or lost. Do it on the correct line, check it, and if you travel outside the EU, avoid expensive roaming from your carrier. Arrive with data from minute zero with a travel bundle ready before takeoff: choose your eSIM in our eSIM store and take off without bill shock.
