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All of the current generations of Mobile plans, mobile broadband plans, and tablet plans (including the BYO and casual options) are able to share and will automatically share with any other eligible services on the same billing account.
This is the same for many of the more recent plans, the everyday connect plan (a few years back) were the first to support it but they needed you to add a data share option, all the ones since it was automatic.
It can only be done on plan services not prepaid and only on services on the same account.