Xiaomi
Delete a Contact auf Xiaomi
A contact reached from Calls or Messages on a Xiaomi phone is not a separate copy. It is the same entry stored in the Contacts app, so deleting it there removes the number from calls, messages, and the contact list in one step.
What happens when you delete a contact
MIUI treats this as a permanent local action. Even if the contact was originally synced from your Google Account, the phone still lets you remove it, and the deletion cannot be undone from the device afterward. If you might need the number again, save it in your Google Contacts app before removing it here.
Steps to delete a contact
Open Tap on Contacts and go to Choose a Contact to select the entry you want to remove. Inside the contact, use Open the Menu to reveal the available actions, then select Tap on Delete. A confirmation prompt appears, and you confirm with Tap on Delete again to complete the removal.
Once confirmed, the contact disappears from Calls, Messages, and the Contacts app at the same time.