Why do I have 850mb of data?

It says this

base : 200mb
Rollover: none
Earned: 200mb
Shared: 450mb

I have 9 friends so I get 450mb
Where does the 200mb earned come from?

I have 9 days left in cycle so we'll see what happens then

It looks like you've hit the freedompop data bonus lottery. Mysterious data bonuses seem to pop up randomly for some folks-- I think PEW has reported one or 2 in the forum over the last few months.

They just want to make you addict to their data so that you will pay for it after this billing cycle.