eSIM for Czechia

Viasimo's Czechia eSIM starts at $1.29 for 500 MB over 1 day, running on O2 and Vodafone with 5G where available. Plans last 1 to 180 days, arrive by email in minutes and install from your phone's settings, with no app.

Works everywhere in Czechia

Carlsbad Region
Central Bohemia
Hradec Králové Region
Liberec Region
Moravian-Silesian Region
Olomouc Region
Pardubice Region

Select your planIn stock

Duration

Quantity

Unlimited data · 3 Days$6.99

Unlimited data · 3 Days ×1

$6.99

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Dial *#06# on your phone. If you see an EID number, your phone takes an eSIM. Most phones sold since 2019 do.

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Network

Which networks does the Czechia eSIM use?

Host networks: O2 / Vodafone

Your eSIM picks one automatically; you do not choose or switch between them.

Data: 500 MB – 50 GB or unlimited
Validity: 1–180 days
Speed: 4G LTE / 5G
Hotspot / tethering: Supported on most devices
Activation: Starts when you first connect in your destination
Speed management: Roughly 2-3 GB per day at full speed, sometimes less depending on the local carrier, then reduced
Top-ups: Add more data from your account, before the plan expires
Text messages (SMS): Data only: use an app for verification codes
Unused validity: 180 days before it must be installed

Setting up Buy, scan the QR code we email you, and switch on the travel line when you land. How it works

Choosing a plan

How much data do you need?

The allowances below are our sizing recommendations, not measurements. The plan beside each one is the cheapest option on this page that covers it.

Recommended data allowances matched to the plans sold for this destination
You are	Plan for	Cheapest plan that covers it
LightMaps, messaging and the occasional lookup	About 1 GB a week	$1.591 GB, 7 days
TypicalMaps, social, photos and some browsing	About 3 to 7 GB a week	$4.595 GB, 30 days
HeavyVideo streaming, video calls and uploads	10 GB a week or more	$8.0010 GB, 30 days
Working or sharingTethering a laptop, calls and cloud sync	20 GB a week or more	$13.99Unlimited, 7 days

Work it out from your own habits

What a week abroad costs

eSIM, local SIM or roaming?

Charged per day

Your carrier roaming

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A SIM at the airport

$1.29

Viasimo, one bundle

Only the Viasimo figure is a price: it comes from today’s live catalog. The other two rows are directional, not quoted rates.

About this eSIM

Czechia is a compact, densely settled country, so data here is rarely the problem. You get 5G in the capital and 4G across the towns, motorways and rail corridors that carry almost every visitor. The gaps are in the border forests and the mountains, and they are small.

Getting online when you land

Do the install at home, over wifi, before you travel. Then the profile is sitting on the phone waiting, and arriving becomes a matter of one switch rather than a search for a hotspot in Vaclav Havel airport's arrivals hall.

Switch the profile on after landing and enable data roaming for it. If you are coming in by train from Vienna, Berlin or Krakow instead, do it as you cross; the attachment happens quietly somewhere in the countryside and you will notice only when your map redraws.

Keep your regular SIM in for calls. Apartment hosts in Prague and Brno will ring you about key collection, and a number that does not work makes that conversation harder than it needs to be.

The networks you'll be on

Two operators carry traffic here: O2 and Vodafone, both running 4G LTE and 5G where it has been rolled out.

The overlap between them is what makes the country feel well connected. A valley or a stretch of forest that is poor for one operator is frequently fine for another, and a roaming handset can attach to whichever is reachable rather than being tied to one footprint.

Day to day this means a 5G connection in and around Prague, dependable 4G through the rest of the inhabited country, and an occasional weaker 4G moment in the hills. All three carry maps and messaging without complaint.

Where coverage holds, and where it thins

Strong: Prague in its entirety, including the outer housing estates and the airport road; Brno and the Moravian towns around it; Ostrava and the industrial north-east; Plzen, Olomouc, Liberec and Hradec Kralove; the D1 motorway spine and the main rail lines; and the tourist towns of Cesky Krumlov, Karlovy Vary and Kutna Hora.

Patchier: the Sumava forest along the Bavarian border, where protected woodland means few masts; the Krkonose and Jeseniky mountain ranges, particularly on ridge walks and in the deeper valleys; the Bohemian Switzerland sandstone gorges near Hrensko; the Moravian Karst caves, where you are underground and will have nothing at all; and the quieter agricultural stretches of South Bohemia between villages.

Two urban specifics. Prague's metro tunnels are the least dependable place in the city for a connection, so load your route before you descend rather than assuming you can check it on the platform. And the old town's narrow lanes and heavy stone can blunt a signal that is perfectly strong on the square you just left.

What you'll actually use data for here

Transport apps do the most work. Prague's integrated public transport system sells tickets through an app, live-tracks trams and tells you which of three connections is actually running, and the national rail operator does the same for intercity travel. Buying paper tickets from a machine is possible but slower and rarely cheaper in effort.

After that: navigation on foot, because Prague's medieval street plan defeats a sense of direction that works fine everywhere else; restaurant and beer hall bookings, which are genuinely necessary in the centre on weekend evenings; and translation for menus, since Czech shares almost nothing with the languages most visitors bring with them.

You will also want a connection for the small friction points: contactless payment backups, parking zone apps in Brno and Prague, checking whether a castle is on its winter schedule, and confirming a driver if you use ride-hailing, which operates widely in the larger cities.

Before you fly

Download offline maps of Prague plus any regional area you plan to hike in. City mapping is the one you will use daily; the mountain maps are the one you will be grateful for on a ridge.

Screenshot your apartment address written in Czech, complete with the district number. Prague addresses carry two numbers on the same plaque and giving a driver the wrong one is a well-worn way to end up on the other side of the river.

Bring a power bank if you are doing long walking days. Constant navigation in a dense city eats a battery quickly, and the trams do not have chargers.

Finally, cache your rail bookings and any timed museum or castle entries as screenshots. Ticket inspectors and gate staff will take a picture on your screen, and it is one less thing to depend on a connection for.

Unlimited runs at full speed up to a fair-use limit, then continues slower.

Before you buy

Important to know

This is a data-only eSIM. It carries no calls or SMS on its own number.
Your existing number stays on your primary SIM, so calls and verification texts keep working.
Your phone must support eSIM, and some carrier-locked phones cannot install one.
Signal varies with location, terrain, congestion and your handset. Dense urban areas are consistently better served than remote ones.
5G only works where the host network has deployed it and your phone supports it. Everywhere else it falls back to 4G LTE.
The eSIM selects a host network automatically. You cannot pick or switch between them.
Unlimited plans run at full speed up to a fair-use limit, then continue at a reduced speed. Read the fair usage policy

Looking for more information?

Frequently asked questions

Does an eSIM work in Czechia?

Yes. Your Czechia eSIM connects automatically the moment you arrive, with no roaming fees and nothing to set up at the airport. The host networks it can use are O2, Vodafone. Coverage runs on 4G LTE and 5G where the network has rolled it out, and falls back to 4G elsewhere.

Do I get 5G in Czechia?

Yes, where it has been deployed. 5G runs on O2, Vodafone in Czechia, and your eSIM uses it automatically on a 5G-capable phone, dropping back to 4G LTE outside covered areas. No country is covered everywhere, so 5G availability varies by location.

Why does my phone show 'E' instead of 3G in the Czech mountains?

Because Czechia no longer has 3G. T-Mobile, O2 and Vodafone all switched it off in 2021 and reused the spectrum for 4G and 5G. Where 4G can't reach, such as in deep Šumava valleys or on high Krkonoše ridges, phones fall back to 2G (EDGE, shown as E). It can send a text-based message, but it won't load maps. Move to open ground to get 4G back.

Is it cheaper to buy Prague transport tickets in the app?

Yes. The PID Lítačka app sells tickets for less than paper: a 24-hour Prague ticket is 140 CZK in the app against 150 CZK on paper. Buy it before you board a tram or bus, or before you enter the metro. Ticket inspectors check the ticket on your phone screen, so make sure your battery will last the day.

How do I tell emergency services where I am in Prague?

Look for the six-digit code at eye level on a nearby lamp post. The UK government says Prague police can use it to locate you if you can't give an exact address. Call 112, which connects to all services, and read out the code. Phone location sharing helps too, but the lamp-post code works even if GPS is poor.

Can I book an Uber at Prague airport without the app?

Yes. According to the UK government, Uber at Václav Havel Airport can be booked in the app, at a self-service kiosk or at a service counter in the terminal. Kiosk bookings are usually slightly more expensive. With data working on arrival, you can compare prices in the app and use the airport's marked pick-up points.

How much data do I need for 7 days in Czechia?

For 7 days in Czechia, Viasimo sells 1 GB for $1.59 and unlimited data for $13.99. Our sizing recommendation, not a measurement: maps, messaging and the occasional lookup, about 1 GB a week; maps, social, photos and some browsing, about 3 to 7 GB a week. The data calculator on this site works it out from how you actually use your phone.

Installing, keeping your number, topping up and hotspot work the same everywhere: see how it works →

Know before you go

Czechia: what to know before you land

Czechia has three mobile networks: T-Mobile, which had the most customers in 2025, O2 and Vodafone. Your eSIM uses O2 and Vodafone. All three switched off 3G in 2021, so in a weak spot you drop from 4G or 5G straight to 2G. Prague's transport app, its lamp-post location codes and Mapy.com are the local tools worth setting up.

Emergency: 112 155 ambulance, 158 police, 150 fire
Plugs: CE 230V
Currency: Czech koruna (CZK)

Main airports

PRG Václav Havel Airport Prague
BRQ Brno-Tuřany Airport

Apps worth having PID LítačkaMapy.comUberBoltWhatsApp

T-Mobile, O2, Vodafone and the end of Czech 3G

The Czech market has three network operators. T-Mobile Czech Republic is the largest, with more than 6.5 million customers in 2025. O2 Czech Republic and Vodafone Czech Republic (which began as Oskar) are the other two, and your eSIM uses both of them.

5G arrived in 2020, and in 2021 they closed their 3G networks. T-Mobile and O2 went first, and Vodafone switched off on 30 November 2021. The spectrum was reused for 4G and 5G. The result is a two-tier network: 4G or 5G nearly everywhere people live, with the old 2G layer kept as a basic fallback.

If your status bar shows E or G in Šumava or on a Krkonoše ridge, you're on 2G. That is too slow for maps but usually fine for a short text-only message. Rather than waiting for 3G that no longer exists, walk a few minutes towards open ground or a village until 4G returns.

Uber kiosks at Václav Havel Airport and taxis in Prague

Most visitors land at Václav Havel Airport Prague (PRG). The UK government notes that Uber can be booked there in three ways: in the app, at a self-service kiosk or at a service counter. Kiosk bookings usually cost a little more than the app, so having data working by the time you reach arrivals saves you money.

In the city, ride-hailing apps such as Uber and Bolt are the easiest way to avoid Prague's long-running taxi overcharging problem. If you take a street taxi, the UK government advises using a major company, checking the rates displayed on the side of the car before you get in, and avoiding unmarked cars whose drivers claim to be taxis.

The same advice warns about fake police officers in the tourist centre who ask to see your passport and foreign cash. Real Czech police have no right to inspect your money. Offer to walk to the nearest station, or call 112 to check whether the person is genuine. A working phone makes it much easier to refuse politely.

PID Lítačka tickets and Prague's lamp-post location codes

Prague's public transport (PID) sells tickets through the PID Lítačka app, and they are cheaper than paper. A 24-hour Prague ticket costs 140 CZK in the app against 150 CZK on paper. Buy it before you step on the tram or enter the metro, because you need a valid ticket from the moment you board, and checking a phone screen is the only inspection you will need to pass.

The city has another useful phone-related feature: many lamp posts carry a six-digit code at eye level. If you need police or an ambulance and can't give an address, perhaps late at night in the winding lanes of Malá Strana or on an embankment path, read that code to the 112 operator and they can locate you.

If you get into trouble in the centre, the main police station at Jungmannovo náměstí 9 (metro Můstek) is open 24 hours and has English-speaking interpreters. Save it in your maps app so you can walk there without having to search.

Mapy.com for Šumava, Krkonoše and Czech marked trails

For walking outside the cities, most Czechs use Mapy.com, the mapping service from the search company Seznam. It was called Mapy.cz until it was renamed in May 2025. Its hiking maps show the country's dense network of colour-coded marked trails and plan routes along them, which is more detailed than the general-purpose map apps for places such as Šumava, the Krkonoše ridges, the Jeseníky hills and the sandstone gorges of Bohemian Switzerland.

Since December 2024, unlimited offline maps have been part of Mapy.com's paid premium tier. If you plan a long walk in the border forests, either pay for it or download the free offline areas you can before you set off. The quietest valleys may only have that 2G fallback, which is too slow to load map tiles while you walk.

Remember that a Czech eSIM plan ends at the border. Šumava continues into Bavaria and Krkonoše into Poland, and ridge paths cross the line repeatedly. Your phone may connect to a German or Polish mast without you leaving Czech soil, so watch the network name if you are near the frontier.

Researched October 2026 · 5 sources

gov.uk Czech Republic travel advice: safety and security - GOV.UK
pid.cz Tickets - PID (Prague Integrated Transport)
en.wikipedia.org T-Mobile Czech Republic - Wikipedia
en.wikipedia.org Mapy.com - Wikipedia
en.wikipedia.org Telecommunications in the Czech Republic - Wikipedia

7-day itinerary

Seven days in Czechia: Prague, Kutná Hora, Bohemian Switzerland and Český Krumlov

Three days in and around Prague, a day among the sandstone rocks of Bohemian Switzerland, then south to Český Krumlov and České Budějovice. Everything works by train and bus, so it suits travellers without a car.

Length: 7 days
Bases: 2

When to go May to June and September give mild walking weather and thinner crowds than July and August; Prague's Christmas markets run from late November, but some national park boat trips and castle interiors are closed from November to March.

Day 1 Prague

Prague: Old Town and Josefov

From Václav Havel Airport, take bus 119 to Nádraží Veleslavín and metro line A into the centre, about 45 minutes in all; buy tickets in the PID Lítačka app.

Start in Old Town Square to see the astronomical clock on the Old Town Hall strike the hour, then climb the hall's tower for the view over the Týn Church. Walk into Josefov, the former Jewish Town, to visit the synagogues and the Old Jewish Cemetery run by the Jewish Museum. Finish crossing Charles Bridge towards Malá Strana in the evening, when the day crowds have thinned.

Signal Central Prague has dense 5G on O2 and Vodafone; the metro has signal in stations and most tunnels.
Day 2 Prague

Prague Castle, Malá Strana and Petřín

Tram 22 from the centre to the Pražský hrad stop takes about 15 minutes.

Take tram 22 up to Prague Castle and buy a circuit ticket for St Vitus Cathedral, the Old Royal Palace and Golden Lane. Walk down the Nerudova lanes into Malá Strana and look in at St Nicholas Church. In the afternoon climb or ride the funicular up Petřín Hill for the lookout tower, then walk back through the gardens towards the river and the Lennon Wall.

Signal Strong 4G and 5G throughout the castle district and Malá Strana; the thick walls of St Vitus and the palace halls cut signal briefly.
Day 3 Prague

Kutná Hora day trip

About 1 hour by train from Prague hlavní nádraží to Kutná Hora hlavní nádraží, which is near Sedlec.

Take the train east to Kutná Hora, a medieval silver-mining town on the UNESCO list. Walk first to the Sedlec Ossuary, the chapel decorated with human bones, and the restored Cathedral of the Assumption beside it. Then take the local bus or train into the old centre for St Barbara's Church, with its flying buttresses and miners' frescoes, and the Italian Court, the former royal mint.

Signal The main line east of Prague keeps 4G nearly all the way, and Kutná Hora's centre has good coverage.
Day 4 Prague

Bohemian Switzerland and Pravčická brána

About 1.5 hours by train from Prague to Děčín, then a short bus ride to Hřensko; allow a long day there and back.

Leave early for Děčín and continue to Hřensko on the Elbe, the gateway to Bohemian Switzerland National Park. Walk the marked trail up to Pravčická brána, the largest natural sandstone arch in Europe, and, if the boats are running, take the guided boat ride through Edmund's Gorge; the gorges are not open on foot. Large parts of the park burned in 2022, so check the park's current notices for closures before you go.

Signal Signal is good in Děčín but drops to 2G or nothing in the gorges and on the forested ridges around Hřensko; near the Elbe your phone may roam onto a German network, so download your Mapy.com area in advance.
Day 5 Český Krumlov

South to Český Krumlov

About 3 hours by direct coach from Prague, or a train to České Budějovice and a regional connection.

Travel south to Český Krumlov, where the Vltava loops around the old town below the castle. Walk up through the castle courtyards to the round painted tower for the view of the red roofs, cross the Cloak Bridge to the castle gardens, and spend the late afternoon in the lanes of the Latrán and inner town, ending with a walk along the river.

Signal The town and castle have solid 4G; reception weakens briefly in the narrow lanes and inside the castle buildings.
Day 6 Český Krumlov

Český Krumlov: castle interiors and the river

Everything is within walking distance in Český Krumlov.

Book a guided tour of the castle interiors or the Baroque castle theatre, one of the best-preserved in Europe, which can only be seen on a tour in season. In the afternoon hire a canoe or raft for a short stretch of the Vltava, or walk up to the Křížová hora pilgrimage church on the hill east of town for a view back over the old town.

Signal 4G on the river and on the hill above town; the deeper bends of the Vltava valley have short dead spots.
Day 7 Prague

České Budějovice, Hluboká and back to Prague

About 30–45 minutes from Český Krumlov to České Budějovice, then roughly 2–2.5 hours by train to Prague.

Head north to České Budějovice and walk around Přemysl Otakar II Square, one of the largest arcaded squares in the country, with the Black Tower beside it. If you have time, take the short bus or bike ride to Hluboká nad Vltavou to see the white, Tudor-style castle and its park. Take the afternoon train back to Prague for your flight.

Signal Good 4G in České Budějovice and Hluboká and on the main line to Prague, with 5G in the cities.

Staying connected on this route

Download your Mapy.com offline area for Bohemian Switzerland before day four; the gorges only have 2G at best, which is too slow for map tiles.
Turn off automatic network selection near Hřensko so your phone does not drift onto a German network across the Elbe.
Buy Prague transport tickets in the PID Lítačka app before boarding, and note a six-digit lamp-post code if you ever need to tell 112 where you are.

Itinerary sources · 4

ceskesvycarsko.cz Bohemian Switzerland National Park: current notices
ceskesvycarsko.cz Bohemian Switzerland visitor information
whc.unesco.org UNESCO World Heritage: Kutná Hora
whc.unesco.org UNESCO World Heritage: Historic Centre of Český Krumlov

Where this comes from

Information and verification

Each block below says what was checked and when. Anything we cannot date, we do not claim.

Prices and plans: Every price and allowance on this page is read from the live catalog, not typed in.; Verified November 2, 2026
Host networks: The operator list comes from the network partner that carries this eSIM.; Verified November 2, 2026