Most of the Android devices come with four quick responses, by default and note that few devices may come with more than four quick responses (for instance: Lyf Wind 7i).
If you wish, you can customize them and here's how (in this instance, I am using Moto G5 Plus):
That's it. You can see the change now.
Repeat the above step for all the ones you want to customize.
And, if you are a beginner, let me explain how to use these quick responses.
As you know, you can reject a call by swiping the "Phone" icon to the left and accept the call by swiping it to the right.
But, if you want to use quick response, do the following:
When you got a call, swipe the "Phone" icon to the top, and you can see the four quick responses and an option to write your own text.
You can choose any one of the quick responses you prefer or the option to write your own text (in the popup, you need to write your text and then tap "Send" option).
That's all. The call will get rejected, and the person who called you will receive the quick response you choose or the text you write as SMS.
Note: In the Android devices with the older version, you may find the "Quick responses" in a different name. In my Android device with Jelly Bean, it is referred to as "Reject SMS."
I hope that this guide is useful to you. If it is, share this guide with your friends.
How to Customize Quick Responses on Android