I would have thought that using wifi with an iPhone for Netflix etc I wouldn't have had to be concerned about exceeding data limit and incurring extra charges as cellular data would not be being used. Now it seems safest option is to watch netflix through my wii on the Tv. i honestly thought watching netflix on iphone using wifi only, the only extra thing I would have to pay if on wi fi would be the monthly fee for netflix and our phone bill for texts and calls as cellular data on phone off.