VOIP call costs are starting to undercut mobile phone operators' tariffs, particularly on roaming and international calls, according to a recent Fitch Ratings report. The study said that mobile VOIP phone calls are between 10 and 20 times less than a 3G mobile phone call.
According to Fitch, mobile VOIP is unlikely to achieve mass market take up for some time. However, the report adds: 'As network quality improves, selective usage of mobile VoIP could start to impact operators' revenue from higher tariff services like international calls and voice roaming. Article