I disabled my voicemail when i was travelling. I am trying to enable it again but when I go to Call forwarding I only see FORWARD ALL CALLS and my options are Do Not Forward and the other option is the Voicemail forwarding number. I am not seeing the other options such as Forward if busy, no reply etc.
I think it depends on your carrier, you have to dial a code, like *282125551212, where the 2125551212 is the number to forward to, they'll have different codes depending on if you want conditional or unconditional forwarding.
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