Global Mobile VoIP Market is poised to grow at a CAGR of 28.47% during the Forecast 2016-2020, as it's offering low-cost international calls, and roaming calls: ResearchMoz Albany, NY, June 13, 2016 (GLOBE NEWSWIRE) -- VoIP functions on broadband networks using packet switched telephone networks (PSTNs), unlike traditional calls on circuit switched networks. PSTNs...