When people try to leave a voicemail, they are told my VM box is full. I called in to VM using *86, and can't delete any from there. Took phone to verizon, we tried switching SIM cards, no luck. There is nowhere to delete VMs on visual VM - it says "No Voicemail". The Verizon tech said it might be "linked to my phone number" and suggested I change numbers, which I don't want to do. Backed it up, wiped it clean, restored it - still no luck. HELP!!