T-Mobile Tests Dual Wi-Fi and Cell Service

T-Mobile has become the first major carrier to allow a phone in the U.S. to communicate over both cellular networks and WiFi hot spots. Clearly, this could hurt a lot of Internet telephony companies, like Vonage and the plethora of other start-ups in this area. You can bypass them now by simply making a call with your cellphone, using your home WiFi connection (if you have one, of course). T-Mobile is behind in terms of customer count, and so this might help them. However, other carriers are bringing similar offerings to market soon.