There has been an increase in people using their mobile phones to access VoIP services.
Data from In-Stat suggests that in 2011, the number of active mobile VoIP subscribers rose to 29 million - up from 2010's figure of nine million.
The organisation believes this is due to the fact more individuals now own smartphones and by 2015, revenue from the sector could total over $4 billion (£2.5 billion).
Handsets are also becoming increasingly advanced and offering more services, with the greatest number of VoIP users likely to be in western Europe.
However, senior analyst at In-Stat Amy Cravens said the market is still in its infancy and therefore some aspects of mobile VoIP are uncertain.
She added that "because it's in its nascent stage, there are significant opportunities for companies to develop the market".
This is not the only mobile related technology that is likely to become more prevalent in 2012, as uSwitch.com recently predicted there will be a growth in quad-core handsets.