In Czech Republic: get an eSIM before you go.
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An eSIM is the better choice for Czech Republic. eSIM coverage in the Czech Republic is excellent, and EU roaming rules mean many home carrier plans already include it.
No — Czech Republic doesn't require passport/ID registration to get connected.
Buy your eSIM online before you fly (Airalo and similar marketplaces cover Czech Republic) and install the profile while you still have WiFi — it activates the moment you land.
Only if you're fine paying your home carrier's international roaming rates — check your plan first, since those can add up fast compared to a local SIM or eSIM.
Airport SIM booths and roaming plans are the expensive way to get online. A Saily eSIM (by the team behind NordVPN) installs on your phone before you fly, activates automatically when you land in Czech Republic, and gives you prepaid data at local prices in 190+ countries — no physical SIM, no contract, no surprise bill.
See Saily data plans for Czech Republic →Disclosure: if you buy through this link, TravelSmarter may earn a commission at no extra cost to you. It keeps our tools free.