Voip applications that run on mobile devices or that are integrated into mobile devices are called

VoIP applications that run on mobile devices or that are integrated into mobile devices are called IP phone or mobile telephony.

VOIP is an acronym for Voice over Internet Protocol or in colloquial terms it is also called phone service over the internet. Many people use VOIP in addition to the traditional phone service as VOIP calls are available at lower rates.

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