Tango Networks is aiming to assuage the pain of US mobile users attempting to manage two phone numbers using a single device. Dubbed the Abrazo Multi-line Service, the cloud-based product aims to bring Google Voice integration to "all mobile phones" and allow wireless users to manage multiple numbers without the hassle of additional software -- meaning your RAZR 2 can join the fun. Calls placed to handsets utilizing Abrazo will ring all phones in your Google Voice roster and users can choose which caller ID number to
