If you purchase our plan in the middle of the month, for example, on October 16th, your package will be activated immediately. It will be valid for 30 days until November 15th, which is the expiration date of the plan. However, since our package has both time and data usage range, if you exhaust all the data included in your plan by October 30th, the package will not expire but become unusable as there will be no available data remaining. Under that circumstance, if you still need to continue using the service, you will need to purchase an additional data package. The additional data package will be valid within the duration of your package, meaning the data from the additional package cannot be carried over to the next billing month. Therefore, we recommend planning your data usage wisely to avoid any unnecessary loss.