Voice over internet protocol, commonly known as VoIP, is technology that enables a smartphone to deliver multimedia sessions and voice communications through the internet. Nowadays, a number of services like the Broadband Phone Service, Broadband Telephony and Internet telephony are represented as the VoIP. Many apps have been specially designed for smartphones for providing VoiP capabilities to users by installing these apps on phones to deliver uninterrupted services. Here are the apps there to support VoIP facility to smartphones: A number of apps are there for supporting VoIP facility in your phone. The names of such apps are Google Voice, WeChat, Nymgo, Vonage, MagicApp, ezTalks, Skype, Tango, Line, and Viber. Among these, Skype is proved to be the best one. It is the easiest app to install in your smartphone to enjoy the number of services with the help of one app. Although there are Facebook, Instagram, WhatsApp, Messenger and so on for sharing the audio and multimedia sessions, Skype is excellent in this service. It is reliable for uninterrupted domestic calls, international calls, video call service, sharing documents and others. What is the function of VoIP? In general, VoIP is the combination of both software and hardware which uses the medium of the internet for sharing a large number of files.