OK, here's the question: Going on a 10 day Baltic cruise. I have an unlocked Motorola Razr quad-band GSM phone which was used several years back in the UK on a pre-paid SIM card.

As I will be in CPH several days before the cruise leaves, is there a prepaid SIM card that I can obtain that will allow relatively inexpensive calls back to the USA as well as cheap (or free) incoming calls from the USA? I am talking mostly when we are in port rather than using any cell service unique to the ship.

Ports include Stockholm, Helsinki, Talinn, Gdansk, Germant and St Petersburg.

I will also have my USA ATT phone which were roam, but you all know what that will cost!