You have 200 GB per month. In case you don't use any volume in that month, it's lost. In case you reach the 200 GB before end of the month, you have two options: a) Book addtional data volume for additional money -or- b) surf with 32 kBit/s until the end of the month.
Please notice that a month is NOT a "normal" month from 1st to last day, but instead it depends on the invoice cycle. So it may be that the 16th of a month is "your" start, so the volume will then last from 16th to 15th of the following month.
And the other thing: Please notice that the GigaCube is a 24 months contract, so you'll have to pay for the wohle 24 months!
