RoamTheWorldCellPhones.com

Cellphone GSM Frequencies: 900/1800

(This means you will need a GSM cellphone that will work on 900MHz or 1800Mhz to use it in the Czech Republic.)

Cellular carriers for the Czech Republic

T-Mobile Czech Republic a.s.

Frequency: GSM 900/1800
Website: t-mobile.cz

Coverage Map (NONE)

Telefónica O2 Czech Republic a.s. (O2 - CZ)

Frequency: GSM 900/1800
Website: www.cz.o2.com

Coverage Map (NONE)

Vodafone Czech Republic a.s. (OSKAR)

Frequency: GSM 900/1800
Website: www.vodafone.cz

Coverage Map

If you've used either of these networks or roamed in the Czech Republic, please post about your experience and the cost. Feel free to ask questions.