Inside the EU, leave roaming on. EU rules mean your Belgian plan works abroad at domestic rates, so there is nothing extra to pay. Outside the EU, turn roaming off, since it often triggers steep per megabyte charges unless your provider explicitly includes international data. A handful of non-EU destinations are sometimes covered, but that depends entirely on your provider. A quick search for your SIM provider plus your destination country should tell you whether you're covered and what charges, if any, to expect.
The short version: roaming on inside the EU, roaming off everywhere else, unless your plan clearly states otherwise.
That single rule solves most situations, but it only works if you actually know which category your trip falls into and what your provider promises in the fine print. Below, we break down exactly when to flip the switch, what roaming really costs when things go wrong, how much data light travel actually uses, and why so many Belgian travellers still get this wrong even though the answer should be simple.
Want to know more about Firsty's international data roaming and plans?
When To Turn Roaming On
Leave roaming on in these situations.
You are travelling to another EU or EEA country, thanks to "Roam Like At Home" rules from the EU
Your provider has explicitly confirmed your plan includes the destination country
You want to receive calls and texts on your regular number without interruption in EU or EEA countries
You are only travelling for a day or two and data usage will be light, just note that charges may still apply based on your SIM provider and mobile plan
Inside the EU, the European Union's roaming regulation guarantees that calls, texts, and data are billed at the same rate as at home. This has been the law since 2017, and it remains one of the few genuinely traveler friendly rules in European telecom. If your summer trip stays within EU borders, you don't need to disable roaming at all.
Outside that zone, coverage depends entirely on your provider, so confirm coverage before you travel.
| Coverage Status | Countries |
| Always Covered (EU/ EEA; Roam Like at Home) | Austria, Belgium, Bulgaria, Croatia, Cyprus, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Iceland, Liechtenstein, Norway |
| Sometimes Covered | United Kingdom, Bosnia and Herzegovina, Switzerland, Kosovo, Monaco, Montenegro, Andorra, North Macedonia, San Marino, Serbia, Vatican City, Turkey, Albania |
Coverage for the Western Balkan countries in the second list could shift later in 2026, since EU talks to bring Albania, Bosnia and Herzegovina, Kosovo, Montenegro, North Macedonia, and Serbia into the "Roam Like At Home" zone. Nothing is finalized yet, so treat that list as one to look up, not guarantee.
When Should You Turn Roaming Off
Outside the EU, turn roaming off in these situations.
You are travelling to the UK, the US, Asia, Africa, or anywhere outside the EU or EEA
Your provider has not confirmed inclusive rates for your destination
You want to avoid an unexpected bill after landing
You plan to rely on hotel or airport WiFi instead of mobile data
Many Belgian providers still charge non-EU roaming per megabyte, and those charges can add up within minutes of your phone updating apps in the background. Switching roaming off the moment your plane takes off, then turning on WiFi or a dedicated travel data solution once you land, is the safest option.
How Much Data Do You Actually Need While Traveling?
A small amount of data covers more than most people expect.
Sending WhatsApp text messages: about 1MB covers roughly 100 to 200 messages
A WhatsApp voice call: roughly 0.5MB per minute
A WhatsApp video call: roughly 5 to 10MB per minute
Turn by turn navigation in Google Maps: roughly 5MB per hour of active use
Pulling up a digital boarding pass or hotel booking: under 1MB
Requesting a ride through an app like Uber or Bolt: roughly 5MB per trip, including the map view
Added together, a light travel day covering messaging, a bit of navigation, and one ride booking typically uses under 50MB. A cheap prepaid data pack or a light eSIM bundle will covers your basic mobile needs better than paying for roaming as a light user. Firsty Free offers free data usage in 170 countries with no contract, no surprise bill, and no zone chart to check, and is a great solution for light data usage.
The real problem isn't the roaming toggle itself. It is that so few people trust their provider enough to leave it alone. Traditional Belgian telecom contracts often bury roaming terms in conditions that are hard to find and harder to understand, so travellers end up either overpaying out of caution or getting burned by a bill they never saw coming. Neither outcome should be normal, yet both happen constantly to Belgians every travel season.
This is exactly the kind of complexity that legacy telecom has built its business around for years. Bundles that sound unlimited until they are not, roaming rates that depend on which zone your destination falls into, and customer service lines that take longer to explain the fine print than it would take to just fix the problem. Connectivity should not require a spreadsheet before you board a plane.
Platforms like Firsty are built on a simple idea: your connection should just work, wherever you are, without asking you to think about it first. Instead of forcing you to remember roaming rules, fair use limits, and country by country exceptions, the plan is designed so those decisions are already made for you.
FAQ
Should I turn roaming on or off in Europe? Leave roaming on within the EU and EEA. Since 2017, EU regulation requires providers to apply your home rates to calls, texts, and data used anywhere else in the EU, so there is no extra cost.
Does roaming cost money outside the EU? Yes, in most cases. Belgian providers typically charge per megabyte or per minute rates for non EU destinations unless you have specifically activated an international bundle or add-on beforehand.
What happens if I forget to turn off roaming abroad? If you are outside the EU and roaming stays on without an active international plan, your phone can quietly rack up charges through background app updates, even if you never open your phone to browse.
Is it safe to leave roaming on all the time? Within the EU, yes. Outside the EU, only if your provider has explicitly confirmed inclusive coverage for that country. When in doubt, switch it off until you can confirm the terms.
Can an eSIM replace the need to manage roaming settings? Often, yes. A travel eSIM lets you access local or regional data plans without touching your home SIM's roaming settings at all, which removes much of the guesswork for non EU travel. It's exactly the kind of simplification Firsty is building toward: less toggling, less checking country lists, more connectivity that just works.
Why do roaming rules feel so complicated in Belgium? Many providers use zone based pricing and fair use conditions that vary by country and plan, which makes it hard for the average traveller to know their exact costs without contacting customer support directly.
