This may be lifted from other providers and I would still prefer unlimited data but it would be nice to have the option to have a plan where the data buckets were automatic. If I use < 1GB I pay a flat 1GB rate, once I'm over that I pay for the 3GB bucket, if I'm over that I pay for the 6GB bucket, etc.
Basically an extension of the existing plans but rather than paying for X data, I pay for the bucket I use. Preferrably going up much higher than the existing top data amount.