Dictation on Apple Watch
Dictation on Apple Watch
How do I get the dictation to work on my Apple Watch five
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Best reply
See the 'Compose a message on Apple Watch' section in:
Write and reply to mail on Apple Watch - Apple Support
"Dictate text: Tap 
, say what you want to say, then tap Done. You can speak punctuation, too—for example, “did it arrive question mark.”