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Thereareseveraloptionsavailableformakingphonecallsovertheinternetusingamobilephone.Theseservices,commonlyknownasVoiceoverInternetProtocol(VoIP)orinternettelephony,allowuserstomakecallsusinganinternetconnectionratherthantraditionalphonelines.Hereareafewpopularoptions:1.Skype:Skypeisoneofthemostwell-knownandwidelyusedinternettelephonyservices.ItoffersfreecallingandmessagingfeaturesbetweenSkypeusers,aswellaspaidoptionsformakingcallstolandlinesandmobilephones.2.WhatsApp:Whileprimarilyamessagingapp,WhatsAppalsoallowsuserstomakevoiceandvideocallsovertheinternet.CallscanbemadetootherWhatsAppusersanywhereintheworldforfree.3.Viber:ViberisanotherpopularinternettelephonyservicethatoffersfreecallingandmessagingfeaturesbetweenViberusers.Italsoallowsuserstomakecallstonon-Vibernumbersforafee.4.FaceTime:ThisserviceisexclusivetoAppledevicesandallowsuserstomakevideoandaudiocallstootherAppledeviceusersoverWi-Fiorcellulardata.5.GoogleVoice:GoogleVoiceisaservicethatprovidesuserswithafreephonenumberthatcanbeusedtomakecallsandsendtexts.CallscanbemadeusingtheGoogleVoiceapporthroughthewebbrowser.Thesearejustafewexamplesofthemanyoptionsavailableformakingphonecallsovertheinternetusingamobilephone.Withtheincreasingpopularityofinternettelephony,moreandmoreservicesarebeingdevelopedtomeetthegrowingdemandforaffordableandconvenientcommunicationoptions.