If you are using HOME 250, and end up using more than 400 MB, then it becomes a costly affair.Say, you have exceeded by just 200 MB in a month, which makes it 600 MB for that month, then you end up paying:400 + 1.40 * 200 = 400 + 280 = Rs. 680, which is Rs 180 more than HOME 500(with 1024 MB instead of 600). So, HOME 250 users have to be extra cautious. B)