1. Go to the iPhone settings
2. Find the Phone option
3. Toggle off the Live Voicemail feature.
4. After Live Voicemail is off, you will need to dial the following to turn on Conditional Call Forwarding for the following conditions: (See picture below)
Format: *61* [10-digit_PhoneNumber] #
- If unanswered: *61*1234567890#
- If unreachable: *62*1234567890#
- If busy: *67*1234567890#
5. Press the call button to activate the feature. Underlined red is the telephone number you are forwarding to. You will see a message stating what has been configured in your AT&T cellphone after pressing the call button.