I prefer Tablone.
Actually, I see no real need for a separate name at all. That which can be used to make phone calls IS, in fact, a phone. After all, cell-phones have been performing multiple duties for a long time without the need for any additional distinction other than 'smart.' It's not like anyone is going to buy one only for the 'ablet' portion of the package. Is there a Phesktop in the works? A Lapphone?
With that in mind, I still believe the best name (if there has to be a new one) is "Big Ass Phone."