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If you don't want to receive calls or messages from certain phone numbers, you can block them. If you receive a call from a blocked phone number, the caller will hear a busy signal.
1. Find "Recent"
Press the phone icon.
2. Block phone number
Press and hold the required contact.
Press Block/report spam.
To report the number as spam, press the field next to "Report call as spam".
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.