Wife and I have iPhone4s we got from VF on a really good plan for us (30 mins/2500 txt/3Gb data)
These plans end in about 2-3 months.
According to the VF FAQ it says the following. What I want to know is - can we buy an iPhone5 and get a new nano-sim and stay on the plans we are on (which are legacy plans not eligible for resigning) ???
From the VF Support pages:
"What happens when I'm out of termYour account will run as it did before with the same features, but you are now free to re-sign and upgrade your phone as you wish.
The contract carries on as a month-by-month plan untill you decide to change it. You can change the type of plan you have, have a chat with us and we'll see what the best options are for you."
Edit: Found this thread on the VF Forums which seems to answer my question except for the Nano-SIM switch part
http://forum.vodafone.co.nz/topic/10321-smart-1-plan-after-24-months-contract/