A:
Here is the 3G postpaid pricing via Verizion.
Free - 100 MB of data per month
Limitless day pass - $9.99 per day
Additional 1 GB of data - $20 per month
Additional 3GB of data - $35 per month
Additional 5 GB of data - $50 per month
Once the two years has ended you can continue to pay as you go, there is no contract or requirements. Only a charge if you wanted to use it.