Samsung Galaxy Note 4 - Page 123

4.TaptoenableordisableWi-FiCalling.
5.TapMobileNetworks.
WhatIsWi-FiCalling?
Wi-FiCalling,alsoknownasUniversalMobileAccess(UMA),isprovidedbysomecellular
carriersbothtoaugmenttheircoverageandtoprovidefreecallsoverWi-Fi.ThisisnotVoice
overIP(VoIP)callingbutaregularGSMvoicecall,routedviaaWi-Fihotspot,overtheInternet,
toyourcarrier.Becausethecallisnotusingthecellularnetworkinfrastructure,thecallsarefree,
andbecauseofthespeedsatwhichWi-Finetworksoperate,thecallqualityismuchhigher
becausemuchlesscompressionisneeded.ToreadmoreaboutUMA,trythisonlinearticle:
http://crackberry.com/saving-call-charges-recession-your-blackberry.