The telephone in your hotel room is the most convenient, however also the most expensive way to make a telephone call. Each hotel has different rates. One can purchase telephone cards in many denominations at the post office, newsstands, tobacco shops, etc. Public phones are located throughout town. Follow the English instructions on your phone card. Only prepaid phonecards purchased in the Czech Republic will work.  Also, your own telephone company may have a service such as “USA direct” from AT&T. You will need their card and instructions on how to dial it, as each company differs. Your cell phone may work in the Czech Republic and the rest of Europe, however not all do. Check with you cell provider. However, charges will be very high.