I would like some advice from those of you who travel often to and from Europe.

I will be in Switzerland this summer. I usually go to the telecom store there and buy a phone card to use in their public phones whether for calls within the country or to the USA. Sometimes I have used the phones within the Post Office where there are booths and an attendant that you pay. These two methods Have worked for me in the past as the most reasonable. But I haven't been there for a few years. Perhaps things have changed.

What do you recommend as the least expensive method of calling home from Europe?