Re: Seems sensible
Only sensible in a minimalist kind of way - like Morse code. Try using LastFM for music, for example. They use Youtube videos (even if you just listen to the music) and if you have music on all day you'll have 20GB/mo right there.
A 3GB data limit would be about e-mail, banking, and a bit of shopping. Surely you're mistaken! I'm on rural wireless here in Canada. Everybody shares the same tower for many miles around, and the ISP gives us 20GB/mo on just their introductory package. I'm able to live with that, but these kinds of usage levels are not what most people expect when they're talking about internet.