3. Data Add-Ons: If the data allotment is depleted prior to 30 days, a Data Add-On can be added for an additional cost and is available for 30 days. The day you add the Add-On is counted as a full day. Add-Ons are available as long as your account balance is not expired. If you add a Data Add-On, the data in your Add-On will be used before any data remaining in your plan. It is recommended that you use most or all of the data in your plan before adding a Data Add-On. Any unused portion of the data included in your plan remains available until the 30th day of your plan.