[iMore.com]

T-Mobile has today announced Un-carrier 8.0, introducing its new personal Data Stash feature for subscribers. This new Data Stash will enable anyone who doesn't use up their data allowance for that month to store this remaining balance on their T-Mobile account for use another time. Put simply, you'll be able to automatically save the remaining data allowance each month for free, and then use this hidden stash whenever you run over the limit.

Full story from the iMore Blog...

[Septembersrain]

So, this is that amazing roll-over for data that people used to always say would be awesome. Like roll-over minutes, you might need more in January than you do in February. Now you'll be able to have that extra when you need it!

As for me, I'm unlimited. I like my full pot all year around.