I've run into an interesting scenario that hadn't crossed my mind before. One of our employees is preparing to leave the organization. She will be turning in her iPhone and is requesting that we remove all of the data from it. Not a problem, Settings > General > Reset > Erase all Contents & Settings will do the trick.
However, she has recommended that we leave a voicemail greeting (the clip people hear when they reach your voicemail) with a notice that the caller should call our main number rather than wait on a response from her phone number. This makes sense, but I'm not sure if that greeting will be wiped as well when we clear her phone.
I suspect that the greeting is stored on the carrier's end, rather than locally on the iPhone, but I'd like to check first. Does anyone know for sure?