There is also a problem of cellular companies with fake "unlimited" plans. Basically, they offer 3G speeds only till a certain limit after which they throttle it down so much that it is barely usable, like Idea Cellular[1].

I have stopped having any mobile data on my phone and mostly prefer WiFi, since I hate paying for such a limited internet.

[1]: http://www.ideacellular.com/idea/select-circle?PlanType=3Gne...