The number of Voice-over-IP minutes carried across 3G and 4G mobile networks will rise from 15 billion minutes this year to 470.6 billion by 2015, according to a new report from Juniper Research. A rise in VoIP call volume is expected worldwide, although it's expected to be particularly noticeable in developed markets with wider 3G coverage.
Anthony Cox, Senior Analyst at Juniper Research, said "WiFi mobile VoIP is potentially the most damaging of all VoIP traffic as it bypasses the mobile networks altogether. We forecast that mobile VoIP over WiFi will cost operators $5 billion globally by 2015."