SteveON:

NonprayingMantis:

SaltyNZ:

NonprayingMantis: Same construct as telecoms ultra+ plans! but just starts from a lower price point but also with much less data.

http://www.telecom.co.nz/business/ourproducts/mobilephones/ultraplus/

Telecom one starts from $119, but has more data at that price compared to the 2d one.

Additional mobiles costs 39 on telecom but 29 on 2d, however, you can add a tablet to the telecom one for only $10, so depending on the devices it may or may not work out as good.

And it is available to a consumer subscriber, not just a business subscriber. And you can already share with a tablet on 2degrees for free. We've had that for a couple of years now. 

Point taken on the tablet one, I'd forgotten that, but the 'must be a business' requirement is pretty silly.
Anybody can go in and sign up and claim to be a business. (And, unless you requires them to be a business with limited liability, anybody can do that totally legitimately by claiming to be a self employed consultant or something.)

I used to be on a telecom business broadband plan years ago because it had a higher data cap and better overage rates, nobody ever asked me to prove I was a business.

I didn't know Telecom and 2degrees were the same company ...

On another note; I don't see the point in the $89 plan. It doesn't give much extra!