We have a Verizon 15 gig plan with 3 smartphones a laptop and a tablet and use all of it every month with out streaming any movies or music. All devices have update only on wifi and no matter how bad the campground wifi is it will usually update the devices late at night. Other wifi sources are Target, most McDonalds, Staples and Office Depo-Max. I did find that after switching to Verizon that they charge usage at a much higher rate than Sprint. What I used to do with Sprint I used less than 6 gigs, to do the same on Verizon is at least 9 assuming the phones all use 2 each.
