Basics Edit

The Czech Republic has 3 GSM-based network operators:

  • T-Mobile (owned by Deutsche Telekom)
  • O2 (owned by PPF)
  • Vodafone (UK-owned)

A fourth operator Nordic telecom (formerly known as U:fon) is on GSM-incompatible CDMA 450-MHz reaching 90% of the Czech population with up to 3.1 Mbps speed. This band is not compatible with usual CDMA-phones either and only works with devices specifically designed for CDMA 450. They aim to start 4G/LTE on 450 MHz which is also incompatible with all usual GSM or CDMA devices. That's why they aren't mentioned any further.

Since a few years already more than 50 MVNOs have started up: COOP mobile, TESCO mobile,, OpenCall, Kaktus, and SAZKA mobile are given as examples for good data rates, but there are still some more on the market.

2G/GSM covers all of the country on 900 and 1800 MHz like in the rest of Europe. 3G/UMTS is usually on 2100 MHz but it is available only in bigger cities. 4G/LTE is on 800 MHz, 1800 MHz, 2100 MHz and 2600 MHz (Bands 1, 3, 7, 20) available to all users and the coverage is much better than UMTS especially on 800 MHz.

All three operators have 4G/LTE coverage 99% of population in 2018. O2 and T-Mobile also have network sharing agreements for 2G and 3G practically everywhere outside of Prague and Brno. That's why their footprint is almost the same outside these two towns.

SIM cards are available in the stores of the network operators and in many kiosks and supermarkets. Prepaid SIMs in the Czech Republic don't require any personal registration, so even though you insist for prepaid registration by attempting to present your photo ID (or passport), it is useless as the staffs are unable to register it for you at the point of purchase. Recharge vouchers can be bought at many kiosks, post offices and petrol stations.

Unlike in many other European countries, you will lose all credit on a Czech SIM card, if you don't top-up your balance periodically; periodic usage is not enough. This can be hard to do from abroad as some Czech operators may decline non-Czech credit/debit cards for online payment.

A very effective way to use up surplus credit on a Czech SIM card is to spend it on premium SMS for tickets on public transport in Prague. Tickets purchased this way cost the network's standard SMS charge plus the price of the ticket.

EU flag
The Czech Republic is part of the EU, where from June 2017 new international roaming rules are enforced. In most European countries you can now 'roam like at home' at domestic rates rather than excessive roaming rates. Two major Czech operators apply rules without restrictions, but Vodafone and some smaller providers have opted out. For specifics about the new regulation check European Union chapter and every provider below.


Czech T-Mobile has good 2G and 3G coverage throughout the Czech Republic rivalling with O2 and Vodafone: coverage map. It's the market leader in the country with 40% share.

4G/LTE is now also open for prepaid on 800, 1800, 2100 and 2600 MHz (Bands 1, 3, 7, 20) with almost the same coverage as O2 at 93% in 2017.


Their prepaid line is called Twist and sold in T-mobile stores (store locator) and the markets of Mall, Alza, Comfor, CZC, Globus, Tesco, Space Electro, ElectroWorld and Czech post offices as well as online to be sent to a Czech adresss.

As of 2019 they sell old and new SIM card lines:

  • the old lines with the strange purple creature:
    • as regular SIM card for 200 CZK with the same credit loaded and unlimited on-net calls and 100 MB for 30 days
    • as data SIM card for 399 CZK with 4 GB and 100 CZK for 30 days
  • the new lines with the strange creature in orange:
    • as regular SIM card for 200 CZK with the same credit loaded and unlimited on-net calls for 30 days
    • as promotional double SIM with two cards for free with 10 CZK each
    • with 200, 400 or 600 CZK preloaded with the 1, 4 or 10 GB plan preactivated (will auto-renew unless canceled as shown below)

Take care that all new SIM cards have their free on-net calls enabled that auto-renews after 30 days for 149 CZK that doesn't make sense as you can get the same for free by topping up. So better disable this option by texting 'VOLANI4TYDNY D' to 4603 or online or using the app.

The card has a PIN that is printed on the card holder along with the other codes. SIM card has a cut-out lines suggesting that it can be converted to micro- and nano- format. To activate you simply have to place a call and choose English by entering 2.

Recharges Edit

You can recharge in the stores of T-Mobile, Czech Post, Globus, Billa, Rossmann, ElectroWorld and at Fortuna and Sazka betting terminals. You will get a bonus of CZK for your first top-up.

Credit stays valid for 12 months. You need to top-up at least 200 CZK once a year. Check credit by calling *101#. Note that you can't top-up up by non-Czech credit cards online making it hard to keep this plan alive from abroad as nobody without an Czech bank account or credit card can top it up outside the country.

T-Mobile gives 100 MB data and unlimited on-net calls valid for 30 days free when you top up at least 300 CZK. To activate this bonus text 'NASIM VSITI' to 4603. You can top up online or in the T-Mobile app using Mastercard, VISA, Masterpass or Google Pay, but the app offers fewer gradations. 25% bonus will be added on top of the first top-up of the month.

Data feature packagesEdit

The new SIM cards have their daily rate by default. You'll get 1 MB for 1 CZK with a cap of 10 CZK and 100 MB per day. So any use of 10-100 MB is free. To change old SIM cards to it 'IDEN100 A' to 4603.

For more data these data packages are offered with roaming in the EU included:

Data Time Price Activation
unlimited max. 3 mbps 24 hours 99 CZK NIDEN A
150 MB 7 days 69 CZK ITYDEN A
400 MB 30 days 99 CZK MESIC400 A
1 GB 30 days 199 CZK IMESIC1 A
2 GB 30 days 299 CZK IMESIC2 A
4 GB 30 days 399 CZK IMESIC4 A
5 GB 30 days 449 CZK IMESIC5 A
10 GB 30 days 599 CZK IMESIC10 A
6 GB (*) 12 months 499 CZK IROK A

(*) = as 500 MB per month for a year

For activation text code to 4603. The day packs don't auto-renew, but the weekly or monthly bundles will. To deactivate text activation code with D instead of A.

Data-only SIMEdit

T-Mobile offers a data-only SIM called "Twist Online" intended for tablets and laptops. It's sold at their stores and Electron World, Tesco, Makro, CSZ, Comfor, Alza as well as some Czech post offices.

  • SIM-only: 200 CZK with the same credit
  • Alcatel Onetouch 4G PLUS and SIM card: 1449 CZK with 200 CZK credit

This SIM doesn't have packages, but stays at the lowest default rate in the country of 0.40 CZK per MB.

EU roaming Edit

You can use all allowances, even the unlimited daily rate, while roaming in the EU at the same prices as in the Czech Republic without restrictions.

More infoEdit

  • Tethering is allowed


O2 has a good coverage in the country giving you good speed. 4G/LTE is on 800, 1800 and 2600 MHz (Bands 3, 7, 20) and available for prepaid: coverage map. Its 4G/LTE network provides coverage to 90% of the Czech population of the population and combined 3G/4G coverage at 99% and 93% for LTE in 2017.


O2 sells their starter packs in their stores (Locator) or online, sent to a Czech postal address. Prepaid SIM cards are now called Go and come in two starters:

  • Go Free: 150 CZK with free calling to o2 and landlines
  • Go Free Online: 150 CZK with 500 MB for 30 days included. This becomes a 500 MB package for 99 CZK in the second month

Top-up vouchers can be found at O2 stores, kiosks, petrol stations and supermarkets in quantities of 200, 300 and 500 CZK. The credit on your SIM card is valid for up to one year, depending on the amount of recharge. Up to CZK 99 is valid for 45 days, CZK 100 to CZK 499 for 6 months, and CZK 500 for one year. To check credit type *124*#.

Data optionsEdit

You can add their DEN VOLÁNÍ option with calling to all Czech networks and basic internet (unlimited @ 32 kbps) for messenging for CZK 20 per day or CZK 25 with SMS included.

You can add these data packages in up 4G/LTE up to 185 Mbps for 30 days:

Data Price Activation Extra Data
500 MB CZK 150 PR DATA 3 500 MB for CZK 150
1.5 GB CZK 299 PR DATA 4 1.5 GB for CZK 149
5 GB CZK 549 PR DATA 5 5 GB for CZK 249

For activation text code to 999111. Package will renew every week/month, if there is enough credit. To disenable text PR DATA # D (# = package size) to 999111.

The default rate outside of a package is CZK 30 for 24 hours and 30 MB with the first hour charged a maximum of CZK 15. After reaching this or the package limit, data will be cut.

EU roaming Edit

All allowances like data packages can be used without surcharges all over the EU/EEA for roaming.

More infoEdit

  • APN: internet
  • O2 doesn't allow tethering and disenable it on iOS devices. On Android phones it's possible.
  • Website (partly in English):

Vodafone Edit


Vodafone is the smallest of the 3 nationwide network providers by customers numbers in the Czech Republic, but with the best coverage of 4G/LTE right now.

4G/LTE runs on 4 different frequencies on 800, 1800, 2100 and 2600 MHz (Bands 1, 3, 7, 20). For coverage map check here. Vodafone's 4G/LTE is called "Turbo Internet" and they claim a 99% coverage in 2017.

Availability Edit

A prepaid Czech Vodafone start-up SIM card comes in two varieties:

  • for free, only ordered online and sent to a Czech postal address in two working days. It doesn't contain any credit.
  • for 200 CZK and with a credit of CZK 101 available in Vodafone stores (store locator) and kiosks. Another CZK 200 bonus is given when you top-up the first time.

It comes as flexi SIM in all three sizes. The default PIN is 1234 and the SIM is automatically activated when placed in your phone.

The SIM card is valid for 10 months after start of the last top-up, then in passive mode for 3 months to top up and after those 13 months it will be deactivated.

Top-ups are not possible online with a non-Czech credit card, but you may pay with credit card at some shops or ATMs. Vouchers are sold by post offices, kiosks, supermarkets, betting halls etc. for CZK 250, 500 and 1200. Check balance by entering *22#.

Data feature packages Edit

You can activate a data option when you buy the SIM, but be sure not to use data until you get a confirmation SMS. The best way for activation is at the store when you buy the SIM or online on the Self Care Center (which is available in English) here:or by app.

These offers are valid for a month:

Data Calls SMS Price Activation
100 MB CZK 49 by self-service
500 MB unlimited


CZK 99 DATA 99
1.2 GB CZK 199 DATA 199


CZK 349 DATA 349

For activation text code to 7700. These packages don't auto-renew. You may reset your data volume anytime by activating a new bundle.

Vodafone Passes Edit

In the Czech Republic you can add Vodafone's passes for zero rated streaming and social media to all prepaid plans with a running data package valid for one day or month (valid in EU roaming too):

  • Social Pass: Facebook, Instagram, Pinterest, Twitter, Snapchat - CZK 99 monthly, CZK 9 daily
  • Video Pass: YouTube, Netflix, HBO, Stream and others - CZK 199 monthly, CZK 19 dayly
  • Music Pass: Deezer, Tidal, Apple Music, Spotify and others - CZK 99 monthly, CZK 9 daily
  • Chat Pass: WhatsApp, FB Messenger, Viber, Telegram - CZK 99 monthly, CZK 9 daily
  • Cloud Pass: Dropbox, Box, Disc Google, One Drive - CZK 99, monthly, CZK 9 daily
  • combinations:
    • Video + Music + Social - CZK 299 monthly
    • Video + Music + Chat - CZK 299 monthly

EU roaming Edit

Vodafone has two options for EU/EEA roaming available:

  • Vodafone World Roaming: the included allowances of domestic packages can be used without surcharges abroad. Overage fees are at the domestic rate
  • Roaming by the day (na den): CZK 19 for 10 MB per day or Vodafone Roaming Daily at CZK 199 with 100 MB per 24 hours day.

Vodafone advertises heavily the daily pack, but unless you use very little data, the World Roaming rate will surely be better. You'll need to activate roaming before online on your account or by app. World Roaming is the default plan. Note, that there is not international roaming on the visitor plans below.

Offers for visitors (no international roaming, valid only in Czech Republic) Edit

Vodafone, as the only provider in Czech Rep., has special prepaid solutions specifically for the needs of visitors sold only in the Vodafone store in Vaclav Havel Airport Prague at Terminal 2, which is a 3-minute walk from Terminal 1. It's open 7am-9pm every day (except holidays) and English is spoken or other special stores for the Visitors SIM.

  • Data SIM for Visitors: 10 GB within 30 days for CZK 800 or 20 GB for 30 days at CZK 1499. Unlimited calls in the Vodafone CZ network are included, no roaming abroad!
  • Hotspot for Visitors: "Unlimited" browsing on a MiFi with up to 8 devices for 2 weeks 800 CZK, 4 weeks 1000 CZK or 8 weeks 1500 CZK. This offer is available at Prague Airport store and two shops downtown Prague (Wenceslas square and Palladium store - not kiosk). You have to pay a refundable deposit of 1500 CZK for the device. There is a FUP of 20 GB in place for the rental.

These offers for visitors may only be available at the Prague airport and some downtown Vodafone stores. Note that EU roaming is blocked in these visitor plans and they only work in the Czech Republic.

More info Edit

  • APN: internet
  • tethering: yes, allowed
  • dedicated English line (open on weekdays): +420 776 975 324
  • Website in English (not all offers):

COOP MobilEdit

COOP Mobil is a MVNO operating on the Czech Vodafone network on 2G and 3G, no 4G/LTE. It's sold exclusively at the COOP supermarkets throughout the Czech Republic (store locator).


The prepaid SIM card is sold for CZK 200 with the same balance on it. SIM stays active outgoing for 3 months and incoming for 6 months after the last top-up. Start-up credit is valid for 3 months.

Top-ups can be made at COOP too and in some kiosks. Vouchers are available for CZK 150, 250 and 400.

Data feature packagesEdit

The default tariff is CZK 20 for 25 MB per day (= 24 hours). After data is used up the speed will be reduced to 32 kbps. Further 25 MB packs can be bought online for 20 CZK.

  • 300 MB: 159 CZK
  • 1 GB: 399 CZK

For extra data you can add 25 MB at 20 CZK or 100 MB at 60 CZK to the monthly packs.

All the add-ons and monthly packages must be activated by calling costumer service *55 free of charge which may be tricky in English.

More infoEdit

  • data packages can be used for EU/EEA roaming and overage fees at domestic rates
  • APN: internet
  • Website in Czech:

Tesco MobileEdit

Tesco Mobile is a 50/50 joint venture of O2 Czech Republic and Tesco – a major UK-owned supermarket chain. It's operating on the O2 network in 2G, 3G and 4G/LTE.

Availability Edit

SIM cards are sold exclusively at the supermarkets throughout the Czech Republic: Tesco store locator (Prague indicated as Praha, ignore small stores starting with the word EXPRES as there might be limited availability of the SIM cards). For visitors of downtown Prague the most convenient option is to visit their department store near the National Theatre My Národní (in grocery section at floor –1) close to Národní třída metro station.

The prepaid SIM card is sold for 150 CZK with the same balance on it. The card can also be ordered online to any Czech postal address (however, the only payment option available at this time is to pay the mailman in cash at delivery; if you are not available at the address at the time of delivery, you are only left with a note instructing you to visit a particular post office and make the payment there). The initial balance is valid for 3 months and SIM stays valid for 1 year after the last top-up.

Top ups can be made at the Tesco Mobile website (any amount of 199 CZK or more), in Tesco stores, and in kiosks, petrol stations or the drugstore chain Rossmann.

Data feature packagesEdit

These packages for data can be activated:

Package Data Time Price
7 500 MB 7 days 120 CZK
Mini 100 MB 30 days 99 CZK
Midi 500 MB 30 days 199 CZK
Maxi 1.5 GB 30 days 299 CZK
Extra 5 GB 30 days 549 CZK

To activate text name of package followed by a blank and letter A to 99346 e.g. 'Mini A' to 99346. All packages auto-renew. To stop text name followed by D to 99346. For extra data by 'INTERNET R' you can reset all packages ahead of time for CZK 79 or CZK 10 will be charged for every 50 MB overuse.

More info Edit

  • EU roaming without surcharges "Roam like at home" is valid for all plans
  • APN: internet
  • Website in Czech:

SAZKAmobil Edit


SAZKAmobil of the betting agency SAZKA started in 2014 as MVNO. It operates on the Vodafone network in 2G, 3G and 4G/LTE.

Availability Edit

The prepaid SIM card is available for CZK 150 in many stores shown here: tick the shopping basket or online to be sent to a Czech postal address. It comes with the same credit of CZK 150 and 200 MB preloaded.

You need to place a call to activate the SIM card after having put it in your device.

Data feature packages Edit

If you top-up for CZK 300 or more, you get lower call and SMS rates, 1000 Sazka mins and 300 MB data for one month as bonus. For more data, they offer these monthly packages:

  • 100 MB: CZK 50 - activation: R1
  • 500 MB: CZK 150 - activation: R9
  • 1 GB: CZK 190 - activation; R10
  • 5 GB: CZK 390 - activation: R14
  • 10 GB: CZK 690 - activation: R15

To book a package, text code to 8866. For overuse, data will be throttled to 32 Kbps.

More info Edit

  • Domestic packages can be used without surcharges for the EU/EEA
  • APN: sazkamobil
  • Website in Czech: Edit is a MVNO owned by the Czech media group MAFRA. It operates on the T-Mobile network in 2G, 3G and 4G/LTE with speeds up to 10 Mbit/s (for coverage see T-Mobile).

Availability Edit

The prepaid SIM card is available for CZK 200 at many newsagents like Relay or Valmont in the country(locator) or online to be sent to a Czech postal address. You'll get a triple hybrid card with all three sizes perforated. It comes with a credit of CZK 200 and 500 MB data preloaded valid for one month.

You need to make a paid call to activate the SIM card after having put it in your device. It may take some minutes to hours until the internet connection is established thereafter.

You can top up online by credit card, at SAZKA terminals, at ATMs (holding a Czech bank account) or by vouchers sold at newsagents. Minimum recharge amount is CZK 200. Credit stays valid for 6 months and SIM card needs to be loaded at least every year to stay alive. To check credit, type *146# on your device.

Data feature packages Edit advertises with 'free internet'. This means that you get up to 200 MB in high speed valid for 30 days for free in the CZ and the rest of the EU, every time you top-up. Exceeding this quota, you can again recharge, buy a data package or will be throttled to 32 kbit/s. From June 2017 a top-up of min. CZK 200 is required every 30 days or internet service stops completely.

Alternatively, you can purchase one of their data packages for CZ and EU:

  • 300 MB for 10 days: 60 CZK
  • 700 MB for 30 days: 130 CZK
  • 2 GB for 30 days: 300 CZK - max. speed is increased to 20 Mbit/s.

To check data consumption and activate packages type *145# or online on your account.

More info Edit

Kaktus Edit


Kaktus is a MVNO on T-Mobile's network in 2G, 3G and 4G/LTE (see coverage at T-Mobile above) with speeds up to 20 Mbps. They started in 2012 and are directed mainly to the urban youth.

Availability Edit

The prepaid SIM card is available online to be sent to Czech postal address at many newsagents and branded T-Mobile and Žabka stores (Google Maps Viewer) for CZK 100 with CZK 10 or 100 credit, 500 MB data and 250 MB social media data for a start. If you top-up CZK 200 more, you will get 100% bonus credit for first charging. But first charging bonus is available on SIM cards with CZK 10 starting credit only and bonus credit stay valid for month. SIM card has a cut-out lines suggesting that it can be converted to micro- and nano- format.

SIM card needs to be activated by texting 'AKTIVOVAT' to 7350 or online on their website.

Kaktus cards can be topped up in T-Mobile stores, at ATMs and Sazka betting terminals from CZK 50. Credit and SIM card both stay valid for one year. Check credit by *103#.

Data feature packages Edit

Default data rate is CZK 1 per MB. You can add these packages valid for 30 days by sending the activation text to 7350:

Data Social Media Price Renewal
80 MB CZK 50 once-off
200 MB CZK 100 once-off
500 MB 250 MB CZK 100 auto-renew
1 GB 500 MB CZK 150 auto-renew
1.5 GB 750 MB CZK 200 auto-renew
2.5 GB 1.25 GB CZK 300 auto-renew

For check state of package text to 7350: 'BALICEK STAV'. Once the data allowance is consumed, the speed will be reduced to 64 kbs.

Activation is online on your account (in Czech only), by app. Social media sites are Facebook incl. Messenger, Instagram, Snapchat and Twitter. When data is used up, you'll get a message and can choose to add 100 MB for CZK 50 or 500 MB for CZK 100.

EU roaming Edit

Data roaming is charged at a fixed CZK 1 per MB in the EU, not according to roam like at home.

More info Edit

OpenCall Mobile Edit


OpenCall is a favourite among expatriates in the Czech Republic since it started in 2013. It's known for having the lowest interntl. call rates. This MVNO by DH Telecom used to run on the network of Vodafone. In 2016 they've changed partners: now they are on O2's network and 4G/LTE is announced to be opened from 2017. From mid 2016 only new SIM cards on O2 are sold.

Availability Edit

Their new prepaid SIM card 'powered by O2' is available for free online to be sent to a Czech postal address or from retailers all around the country (list) for CZK 200 with an initial credit of CZK 200 which is valid for 180 days.

The new SIM "powered by O2" is widespread rechargeable: every O2 voucher or top-up location works for it. Minimum recharge amount is CZK 200, and the validity of the card will be extended 365days. On the new packs OpenCall EASY is their default tariff.

Data packs Edit

Default rate is the daily pack. Furthermore, they offer these monthly bundles on their new SIM cards 'powered by O2' with 4G/LTE included valid for CZ and EU at max. 40 Mbit/s:

  • 25 MB for 24 hours: 25 CZK - default rate
  • 400 MB for 1 month: 99 CZK, activation: 450MB A
  • 750 MB for 1 month: 199 CZK, activation: 750MB A
  • 1.5 GB for 1 month: 299 CZK, activation: 1,5GB A
  • 5 GB for 1 month: 449 CZK, activation: 5GB A

Monthly data packages are activated with automatic data renew. Packages need to be activated by texting the code to 999348. As they auto-renew, to deactivate text code and replace 'A' by 'D'. When data quota is used up, there will be an automatic increase of data volume of 20 or 60 MB for 12 CZK. You can also get a data reset with the same quota for the monthly packs at 50% of their original price by texting 'INTERNET R' to 999348.

More info Edit

  • Roam like at home is implemented for EU roaming at the same rates as in the Czech Rep. Edit

Odorik-logo-210x76 is a prepaid VoIP provider and since 2013 MVNO too on the T-Mobile network in 2G and 3G and optional 4G/LTE. Their novelty is that more than one SIM card or mobile number can share the same prepaid account and balance. But this leads to rather complicated procedures.

Availability Edit

A new SIM card is sold at 80 CZK without credit plus a refundable deposit for a phone number of 50 CZK. This deposit is given back, when you terminate your number. They send it out all over the world: postage is 15 CZK within Czech Rep., 30 CZK to Europe and 40 CZK to other continents. You need to register and top up your balance online. You can activate the SIM card anytime online, when you need it. If you are in Prague, visit their office located in centre, 80m from the metro station Národní třída near OC Quadrio, open weekdays 9 AM - 7 PM incl. hol. Another office is located in Brno. You can check your balance by dialing 4489. You can top-up online by credit card, internatl. wire transfer to a bank account, at Europay and SAZKA terminals (at 6,800 places in Czech. Rep.) or post offices in the Czech Rep. showing a special bar code given to you.

Data feature packages Edit

Data is active by default: 0.69 CZK for 1 MB, billing by 1 kB, max. speed throttled to 128/128 kbit/s after first downloaded MB within the day. It's possible to activate one of the following data packages online or by calling 4488 valid in the Czech Republic and all over the EU:

Data Price max. Speed
150 MB 60 CZK 5 Mbit/s
300 MB 95 CZK 5 Mbit/s
600 MB 160 CZK 10 Mbit/s
1 GB 220 CKZ 20 Mbit/s
1.5 GB 295 CZK 20 Mbit/s
2 GB 320 CZK 20 Mbit/s
3 GB 440 CZK 20 Mbit/s
10 GB 690 CZK 20 Mbit/s

Each data package is valid only till the end of the current calendar month. So avoid purchasing a large package at the end of the month if you don't use it up in few days. Data on up to 3G speeds only.

  • 4G/LTE speed is available for an extra fee 10 CZK/month

Further fees Edit

If you spent less then 100 CZK during the last 30 days on your SIM card line (not your account), you will be charged 0.70 CZK fee per day for your active SIM card. However, you may suspend/resume the SIM card online to avoid this fee. The balance, phone number or SIM card doesn't expire, so it can be good option if you visit Czech Rep. from time to time.

Two years after last recharge to your account, another fee will be imposed: 2 CZK per month are charged for inactive accounts.

EU roaming Edit

International roaming is blocked by default. You will need to sign this amendment to contract, where you undertake to pay in 30 days any debit that could occur on your account due to roaming services or premium SMS services. You can sign in their office (Prague or Brno) or verify your signature at any post office (fee: 30 CZK) and send it to them by post. Only then, roaming is opened and "roam like at home" rules apply.

More info Edit

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