Ability to customization your plan. If you know you'll use less minutes but need more data then you say decrease the amount of minutes you have but add more data and vice versa. For example I get 400 mins and 400 mb of data. I only need about 50 mins (if that. I RARELY use my phone for talking) yet it would be nice to have more data. I am paying for minutes I'm not using.
Best answer by Philosoraptor