Work Number tracking is a feature that can be added by following these steps:
  1. Access the TMM Store.

  2. Scroll down to the "Single Items" section and tap the "Add Work Number" row.

  3. The "Info" page will then load which will provide you with details about the purchase.

  4. You can also view screenshots:

  5. When you are ready to purchase, tap the "Buy" button in the upper right corner of the screen.

  6. Then follow the In-App purchase instruction provided by Apple to complete the purchase.