Reply to a call by a text message
If you can’t speak right now, you can reply to the caller by a text message.
1. When someone calls you, tap TEXT REPLY.
2. Tap type a message..., and write your message.
You can only reply by a text message to calls from the contacts saved in your phone.
Switch text reply on or off
> settings, and switch Text reply to On
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Edit a pre-written text message
> settings > edit replies, and edit the reply you want.