I don't want to bring my mobile as I don't know if it works out there, whether it is the most expensive way to phone home, and anyway I don't fancy the extra weight of a charger AND adaptor!
your mobile will work if unlocked for roaming - who is your provider? speak to your provider.
if vodafone you can phone from uk out of your free allowance ....
you could buy a payg polish sim ....
Can I use Skype in internet cafes?
not sure in cafes