Unfortunately it is a breakdown in communications between your unit and the verizon vmail service. When you have a vmail on your account Verizon is sending a signal to your phone but the phone does not recognize it as the firmware for the phone is still under sprint. Unfortunately there is nothing you can do until Verizon/Samsung releases a firmware that will be compatible for the unit. Your best bet is to have your vmail call your phone when you get one.