As stated in the topic. I have been trying to find out if this is possible and if so, if anyone does it. (Moving overseas and need the number active for at least a few months).
I found an old geekzone topic from 2016 which says it's not possible. But maybe things have changed since then?
Call diversion seems to require me to maintain a plan.
This topic suggests keeping the SIM and prepay.
https://www.geekzone.co.nz/forums.asp?forumid=81&topicid=302856
I spoke with Hero, and they don't support it and suggested that maybe an overseas VoIP provider might do it (which seems a bit odd to me?).
Thank you