To ignore a call and send a text message

To display the Ignore with message option on the Incoming call screen, enable it in the Phone app's Call settings menu.

1. Tap the Home button
   
   > the Phone icon
   
   > the Menu icon
   
   > Call settings.
2. Tap the Call blocking & Ignore with message > Allow ignore with message switch to toggle it On (blue).

NOTE	This feature can only be used to send a message to another mobile phone. It's not applicable to incoming landline calls.