Being able to adjust your usage time between Data and Airtime Minutes. For an example. I have a $39 dollar plan that gives me 400mins airtime and 400mb data but, I use more data than the minutes per month or vice versa. So for an example I need more data. I trade 150 or 200 airtime minutes for 250mb of data for the same price in which plan your are in. Would be nice to be flexible that way.