Yes, I will eventually visit Poland (but Scanadanvia is next).
The card is here,
http://www.comfi.com/Phone-Card/Chopin
it has toll-free numbers in many countries, including Poland. The following number can be called countrywide using a payphone (or at least that's what it's supposed to do). 00-800-111-4553.
The number in the UK is 0-800-358-7120.
I bought this card because it has per second billing, no connection fee, no maintenance fee, toll-free numbers (in many countries), no taxes, and it's valid for at least 3 months.
The only part I don't like is the payphone surcharge per call (99UScents), and the outgoing rate to mobiles (20p/minute), but remember it's billed by the second (or that's what they advertise).
I bought this phone card in vain until I heard about the ASDA SIm card in the UK. I will purchase the SIM, and not use this card (except for when my cellphone doesnt work), but then I will still have my VOIP software (via net), so I don't know if I will ever use this card.