Re: Pot meet Kettle
If Facebook is on a dumb phone, the phone supports is. As for plans, most of the plans out there provide a daily allowance just for Facebook (you can see where this is going).
Yes. It's going into weird charleyboy fantasyland where what he says goes and reality is long gone.
Lots of dumb phones don't have FB, built in or not. There are providers who still do non-data plans, though some of them are the more obscure smaller companies like Vodafone - they're so tiny you probably never heard of them though. (I am assuming their plans in NZ are like plans elsewhere).
Data can be turned off on phones as well, although I wouldn't exactly trust Google to honour that (even less so Apple) - hence why if using a smart phone I'd have data blocked at the provider level.