It does matter because the iphones use a different voicemail system then the rest of the phone on the Verizon Wireless network. Also you can't forward a voicemail to a phone on another carrier.
FYI, please don't post your email signature on this public forum. It is personal info and is against the Terms of Service here.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.