Indeed, Compuserve is the best way to travel through Europe. Their nodes aren't that reliable, though, so make sure you have a bunch of dial-in numbers with you.
If you'd want to use your mobile to connect, make sure it supports 900 or 1800-machines. You can also hire them at airports or buy a prepaid card (I'd suggest Orange as they're somehow internationally available).
When looking around, you'll also find a lot of cybercafé's; most charge between $2-4 per hour.
Hotels DO charge on a per minute base. Local calls cost around $2c/minute in Europe, double them and you have the hotel charge. Ask before connecting though or you could find a surprise when leaving.
Enjoy Europe !!
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