PROS: The innovative knock knock feature allows you to see who is calling before you answer, Extremely simple interface to use, Specialized to work specifically on your mobile phone or tablet so there's nothing you don't need and everything is directed to one purpose: making video calls
CONS: No voice only option, No compelling reason for IOS users to switch to Duo from Facetime for calling other iOS users, Both users need to have Duo installed to start the voice call
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