Great app for international travelers

If you travel internationally you can install this app either on your Mac or Windows laptop, or on your iPhone or iPod and call any US phone number for free, once you have internet access. It gets not better than this if you want to reach your folks at home on their phones without paying anything! I tried it yesterday both on my MacBook as well as on my iPhone both over wifi and over a 3G network and it worked well.

Bibliofil about Whistle Phone