I think the idea is that if you have a non-smartphone, you'd be using much less data, just checking your email, infrequent browsing on a tiny screen, mostly just using voice and SMS. A smartphone, OTOH, you'll be running data-intensive apps, web browsing frequently, streaming Pandora or whatever . . .

These assumptions are not mine, and really are generalizations and I've probably left out a lot of stuff. Certainly any given customer could be the exception in either case, but I suppose on the whole it's accurate enough for business purposes. When AT&T first got the iPhone exclusive deal in the US, data usage from those customers really clogged up their tubes for quite a while.

BTW, when you guys say 2e or 5e a month for data, you mean on top of what you pay for voice service, right? Not a total monthly cost?