Money
The official currency is Zloty (PLN), divided into 100 groszy. Poland is essentially a 'cash country', and it is difficult to negotiate credit cards and travellers cheques in the cities, and well nigh impossible in rural areas. American Express, Diners Club, Visa and MasterCard are, however, accepted in places frequented by tourists. ATMs are also beginning to proliferate in Polish cities, where the sign 'Bankomat' indicates them. Money (preferably US$ or Euros) can be exchanged in the cities and larger towns at banks, hotels or bureaux called 'kantors', which offer the best rates. Banks are open Monday to Friday from 9am to 5pm and some are open on Saturday till 1pm.
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Passports / Visas
A passport valid for at least six months after arrival is needed for those who require a visa. Visa exempt nationals must have a passport valid for period of intended stay (other than EEA nationals). The borderless region known as the Schengen area includes the following countries: Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Lithuania, Luxembourg, Malta, The Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain and Sweden. All these countries issue a standard Schengen visa that has a multiple entry option that allows the holder to travel freely within the borders of all.
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Communications
The international access code for Poland is +48. The outgoing code is 00 followed by the relevant country code (e.g. 0044 for the United Kingdom). City/area codes are in use, e.g. (0)22 for Warsaw and (0)12 for Krakow. Cheap rates apply between 4pm and 6am, and on weekends. Mobile phones work throughout the country, local operators use GSM networks, which may not be compatible with some US cell phones. Internet cafes are available in most towns.
Source: www.wordtravels.com