BlackBerry Messenger
Fring
KakaoTalk
Line
News
Nimbuzz
OneSim VoIP
ooVoo
Rebtel
Skype
Tango
Truphone App
Viber
Vonage Mobile
Vox
Voice Over IP Applications to Rewrite the Future of Mobile Communication?
Back when they were first launched, services such as Truphone VoIP and Skype threatened the mobile landscape with their low…