If Skype was disruptive to telcos, then Cubic Telecom is their nightmare (and good for you)
A few weeks prior to my scheduled departure for Dublin, Ireland where I ran the most recent Mashup Camp, I started handing out the phone numbers of my hotel and traveling companions to people who might want to reach me while I was over there. For cell phone usage, I'm a Verizon Wireless customer and, like Sprint customers, Verizon Wireless' network is based on a radio technology (CDMA) that doesn't work in Europe.