Voice over IP (VoIP) allows a voice conversation to be transmitted as internet traffic rather than as an ordinary voice call.
This means that callers can use Wi-Fi networks or their data plans to make these calls.
These two applications are called voice over Wi-Fi and voice over 4G or voice over LTE.
Operators are currently trying to move voice calls onto 4G, since it is a more efficient use of spectrum than 2G calls and the call quality offered in these calls is better, with calls connecting faster.
What chat apps use VoIP?
Operators are also launching voice over Wi-Fi, which provides coverage to areas not reached by cellular networks and helps consumers cut their costs by carrying the calls on their ordinary internet connection.
Popular chat apps such as WhatsApp and Messenger use VoIP for their call facilities.
According to a report by Zion Research, global demand for the VoIP services market was valued at over $83 billion in 2015 and is expected to reach over $140 billion in 2021 with a compound annual growth rate of above 9.1 percent between 2016 and 2021.