You can dictate a message in a chat or room instead of typing it on the keyboard.
The dictation function is supported from the iPhone 6s without an internet connection. Earlier models and some languages require an Internet connection to use this feature.
To dictate a chat message
1 Tap .
2 Tap the desired chat or room to resume the chat conversation.
3 Tap Aa.
The dialer opens.
4 Tap .
5 Speak the desired text.
The text appears as you speak.
6 Tap to send the message or to edit the text before sending.