Being able to customize these messages and set up what works best for you is a big deal. That send message button can be a life saver if a call comes in at the wrong time.
To change these messages and edit them you would first open up the phone app on the phone. Once that is open tap the three dots in the top right hand corner and then choose settings. From there you'll see an option for "Quick decline messages." You can edit and set up your own messages there.
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