Buying a sims card to match my mobile phone whilst in Poland

Can somebody advise me of the cost to buy a sims card to match my digital mobile phone. Just a rough cost for a 3/4 month stay in Poland or is it better buying a new phone in Poland, thanks in anticipation. ta

You can get a Pay As You Go sim card on any network for only a few zloty depending on what tarrif you want. I don't know what mobile you've got though - if it's a normal mobile that is not locked then you won't have any problems.

I brought my unlocked mobile (nokia 6630) from the UK and just switch to a Polish sim card when in Poland, and switch back to my UK card when in the UK.