Do we need to buy our ONU ourselves?
or Stormfiber provide their GPON ONU?
If Stormfiber provide, what kind of ONU do they provide, with wifi or without wifi?
I think you mean ONT, however it can technically be called an ONU as well.
Depends what network equipment is being used at the Storm Fiber office, if it's Huwaei, then a Huwaei ONT, if it's Alcatel, then an Alcatel ONT, and if it's ZTE, then a ZTE ONT.
Don't know the exact model numbers. Someone with StormFiber would know the exact model and what it looks like.
Sent from my Nexus 6P