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If you no longer wish to divert your calls to your voicemail or another number, you need to cancel the diverts.
1. Find "settings"
Press the phone icon.
Press the dots in the bottom right corner of the display.
2. Cancel all diverts
Press the indicator next to "Call forwarding" until the function is turned off.
3. Return to the home screen
Press the Home key to return to the home screen.