If you have Fios Digital Voice you can change the ring counts and the forwards online. However in order to turn off the Voicemail completely, this requires an order. If you still need assistance, please send me a PM.
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I have the same problem and have not found a way to do this online. I think I need to delete the voicemail service because all my phones are flashing. I found something online that said I needed to send in an email request for a response.