I have a SIM from Vodafone Netherlands.
I believe call costs are as follows:
On a Vodafone passport network, incoming calls received cost,
99 euro cents untimed. Outgoing calls to same country destinations
on my current tariff cost 99 euro cents + 35 euro cents/min.
For calls within the Netherlands calls are 35 euro cents/min.
When calling to Vodafone or fixed numbers, you pay no more than the
3 minute charge for calls up to 60 minutes.
You might check if Vodafone in any country you are visiting offers a similar deal. You may possibly get a a better deal on a SIM pack by visiting a Vodafone shop rather than an other dealer. The one I bought from the shop offered a registration credit of 10 euros -- if it was available elsewhere no one else told me.
If anyone is interested in buying or borrowing my SIM drop me a line.
It has 25 euros credit on it and expires at the end of October.
If you don't read Dutch, you can find out more about it by accessing
http://vodafone.nl via a translation engine such as
http://babelfish.altavista.com