Xiaomi
Turn Quick Responses On or Off auf Xiaomi
Quick responses let your Xiaomi phone send a short text reply when you reject or ignore an incoming call. The feature sits inside the Phone app settings, not in the general system settings, which is why many people struggle to find it.
If the option is switched off, rejecting a call just ends it silently with no message sent. If it is on but the wording feels off or outdated, you can edit each response individually instead of only toggling the whole feature.
Menu path
Open Phone ➔ Menu ➔ Settings ➔ Quick responses. From there, Enable or disable Quick responses switches the entire feature on or off. Tap any existing message under Choose a Quick response to edit it to rewrite the text.
Changes apply immediately, so the next rejected call will use the updated wording. If the setting appears greyed out, make sure the Phone app has the required permissions, since Quick responses relies on the default messaging channel to send the reply.