Which carriers matter, what buying a SIM involves, and when an eSIM is the smarter move.
Reliable mobile internet at better prices than most travel eSIMs, with polished iOS and Android apps and support for making and receiving phone calls.
One of the biggest travel eSIM brands, with a very large destination catalog.
Known for unlimited-data plans in many destinations, at a higher price per gigabyte.
The real Czech trap is credit expiry: unlike most of Europe, credit is lost unless you top up periodically, continued usage does not count, and several operators decline non-Czech cards for online top-ups, so a card can die once you leave the country with no way to revive it remotely. The Vodafone Visitor SIM and Hotspot have EU roaming blocked and work only inside Czechia, and even ordinary Vodafone prepaid has limited EU roaming, so check before relying on a Czech SIM elsewhere in Europe. T-Mobile Twist cards ship with a free on-net calling option that auto-renews at 149 CZK after 30 days unless disabled by SMS. All three networks shut down 3G, so you need a 4G/5G handset, and leftover credit can be spent on Prague public transport tickets by SMS before you leave.
The market leader with the strongest 4G/5G network. Its prepaid line is called Twist.
Near-total national coverage and a prepaid line called Go, though tethering is blocked on iPhones.
The smallest of the three but the only operator with a dedicated visitor product, sold at its Prague Airport Terminal 2 store.
No ID of any kind is needed: prepaid SIMs are sold pre-registered, and staff could not register a card to you even if you offered a passport, because no mechanism for it exists. At most you may sign a short Czech-language form promising the SIM will not be used illegally.
Guac eSIM covers Czech Republic with data plans starting from $1.50 per GB and instant activation, so your phone is online the moment you land. Airalo and Holafly are popular alternatives.
SIM cards and eSIM in Czech Republic