Phone service in the Baltic

I have a Sprint PCS phone. Does anyone know if service is available or can be.. If not, what do you do for phone service (prepaid cards, etc.) I would like to check on my kids a few times. Thanks for your comments.

I also posted this on the Celebrity board...

Kurt

You will probably need to rent a gsm phone. (Just search google, lots of locations.) Europe is on a different standard than the US so unless you have a gsm phone (which Sprint is not), it won't work. If you really want to make sure you have service EVERY where, rent a satellite phone. You can get them for under $50 a week and less than $2/min.

(Ok, disclaimer - I use to work in the cell phone and satellite phone industry) :)