The question is, what are the codes used to make international call to the UK from Poland? that is from a land line.
The international dialling code is 0044. You must also drop the leading 0 from the town code of the Uk number. So to call a number that is 01908 777777 in the Uk you would dial 00441908 777777 from Poland.
Next, when I go to Poland later this year, do I need to use any prefixes before the number to call mobile to mobile ?
No