Vonage Mobile, a new, free app for BlackBerry devices and the Apple iPhone and iPod Touch, offers low-cost international calling over Wi-Fi and cellular networks. Users keep their cell phone numbers but get to ditch calling cards.
– iPhone and BlackBerry users now have a new, inexpensive option for placing international calls.

Voice-over IP (VOIP) phone company Vonage has introduced Vonage Mobile, a free smartphone application for placing calls over cellular or Wi-Fi networks. The service is said to offer savings of more t…