Both me and my wife able to reply Whatsapp message via our Apple Watch, but my friend's watch has no this option. There is no apps on the watch, but when we receive a message, we can choose to reply straight away. More or the less same as the native message app, able to chose the preset reply or via dictation. The only conclusion so far is because both my wife and my iPhone is on 9.1 beta 5, but my friends phone is on 9.0.2. So far, 42mm Black SS (os2) + 6 Plus (9.1 beta 5) = Yes 38mm SS (os2) + 5s (9.1 beta 5) = Yes 42mm sports (os2) + 6s (9.0.2) = No Is there any Apple Watch + Whatsapp users here can confirm that's because the difference of the iOS? Thanks!